diff --git a/src/secp256k1/contrib/lax_der_parsing.h b/src/secp256k1/contrib/lax_der_parsing.h
--- a/src/secp256k1/contrib/lax_der_parsing.h
+++ b/src/secp256k1/contrib/lax_der_parsing.h
@@ -48,14 +48,14 @@
  *   8.3.1.
  */
 
-#ifndef _SECP256K1_CONTRIB_LAX_DER_PARSING_H_
-#define _SECP256K1_CONTRIB_LAX_DER_PARSING_H_
+#ifndef SECP256K1_CONTRIB_LAX_DER_PARSING_H
+#define SECP256K1_CONTRIB_LAX_DER_PARSING_H
 
 #include <secp256k1.h>
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Parse a signature in "lax DER" format
  *
@@ -88,4 +88,4 @@
 }
 #endif
 
-#endif
+#endif /* SECP256K1_CONTRIB_LAX_DER_PARSING_H */
diff --git a/src/secp256k1/contrib/lax_der_privatekey_parsing.h b/src/secp256k1/contrib/lax_der_privatekey_parsing.h
--- a/src/secp256k1/contrib/lax_der_privatekey_parsing.h
+++ b/src/secp256k1/contrib/lax_der_privatekey_parsing.h
@@ -25,14 +25,14 @@
  * library are sufficient.
  */
 
-#ifndef _SECP256K1_CONTRIB_BER_PRIVATEKEY_H_
-#define _SECP256K1_CONTRIB_BER_PRIVATEKEY_H_
+#ifndef SECP256K1_CONTRIB_BER_PRIVATEKEY_H
+#define SECP256K1_CONTRIB_BER_PRIVATEKEY_H
 
 #include <secp256k1.h>
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Export a private key in DER format.
  *
@@ -87,4 +87,4 @@
 }
 #endif
 
-#endif
+#endif /* SECP256K1_CONTRIB_BER_PRIVATEKEY_H */
diff --git a/src/secp256k1/include/secp256k1.h b/src/secp256k1/include/secp256k1.h
--- a/src/secp256k1/include/secp256k1.h
+++ b/src/secp256k1/include/secp256k1.h
@@ -1,9 +1,9 @@
-#ifndef _SECP256K1_
-# define _SECP256K1_
+#ifndef SECP256K1_H
+#define SECP256K1_H
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 #include <stddef.h>
 
@@ -607,8 +607,8 @@
     size_t n
 ) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 }
-# endif
-
 #endif
+
+#endif /* SECP256K1_H */
diff --git a/src/secp256k1/include/secp256k1_ecdh.h b/src/secp256k1/include/secp256k1_ecdh.h
--- a/src/secp256k1/include/secp256k1_ecdh.h
+++ b/src/secp256k1/include/secp256k1_ecdh.h
@@ -1,11 +1,11 @@
-#ifndef _SECP256K1_ECDH_
-# define _SECP256K1_ECDH_
+#ifndef SECP256K1_ECDH_H
+#define SECP256K1_ECDH_H
 
-# include "secp256k1.h"
+#include "secp256k1.h"
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Compute an EC Diffie-Hellman secret in constant time
  *  Returns: 1: exponentiation was successful
@@ -24,8 +24,8 @@
   const unsigned char *privkey
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 }
-# endif
-
 #endif
+
+#endif /* SECP256K1_ECDH_H */
diff --git a/src/secp256k1/include/secp256k1_recovery.h b/src/secp256k1/include/secp256k1_recovery.h
--- a/src/secp256k1/include/secp256k1_recovery.h
+++ b/src/secp256k1/include/secp256k1_recovery.h
@@ -1,11 +1,11 @@
-#ifndef _SECP256K1_RECOVERY_
-# define _SECP256K1_RECOVERY_
+#ifndef SECP256K1_RECOVERY_H
+#define SECP256K1_RECOVERY_H
 
-# include "secp256k1.h"
+#include "secp256k1.h"
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 extern "C" {
-# endif
+#endif
 
 /** Opaque data structured that holds a parsed ECDSA signature,
  *  supporting pubkey recovery.
@@ -103,8 +103,8 @@
     const unsigned char *msg32
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
 
-# ifdef __cplusplus
+#ifdef __cplusplus
 }
-# endif
-
 #endif
+
+#endif /* SECP256K1_RECOVERY_H */
diff --git a/src/secp256k1/src/basic-config.h b/src/secp256k1/src/basic-config.h
--- a/src/secp256k1/src/basic-config.h
+++ b/src/secp256k1/src/basic-config.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_BASIC_CONFIG_
-#define _SECP256K1_BASIC_CONFIG_
+#ifndef SECP256K1_BASIC_CONFIG_H
+#define SECP256K1_BASIC_CONFIG_H
 
 #ifdef USE_BASIC_CONFIG
 
@@ -28,5 +28,6 @@
 #define USE_FIELD_10X26 1
 #define USE_SCALAR_8X32 1
 
-#endif // USE_BASIC_CONFIG
-#endif // _SECP256K1_BASIC_CONFIG_
+#endif /* USE_BASIC_CONFIG */
+
+#endif /* SECP256K1_BASIC_CONFIG_H */
diff --git a/src/secp256k1/src/bench.h b/src/secp256k1/src/bench.h
--- a/src/secp256k1/src/bench.h
+++ b/src/secp256k1/src/bench.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_BENCH_H_
-#define _SECP256K1_BENCH_H_
+#ifndef SECP256K1_BENCH_H
+#define SECP256K1_BENCH_H
 
 #include <stdio.h>
 #include <math.h>
@@ -63,4 +63,4 @@
     printf("us\n");
 }
 
-#endif
+#endif /* SECP256K1_BENCH_H */
diff --git a/src/secp256k1/src/ecdsa.h b/src/secp256k1/src/ecdsa.h
--- a/src/secp256k1/src/ecdsa.h
+++ b/src/secp256k1/src/ecdsa.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECDSA_
-#define _SECP256K1_ECDSA_
+#ifndef SECP256K1_ECDSA_H
+#define SECP256K1_ECDSA_H
 
 #include <stddef.h>
 
@@ -18,4 +18,4 @@
 static int secp256k1_ecdsa_sig_verify(const secp256k1_ecmult_context *ctx, const secp256k1_scalar* r, const secp256k1_scalar* s, const secp256k1_ge *pubkey, const secp256k1_scalar *message);
 static int secp256k1_ecdsa_sig_sign(const secp256k1_ecmult_gen_context *ctx, secp256k1_scalar* r, secp256k1_scalar* s, const secp256k1_scalar *seckey, const secp256k1_scalar *message, const secp256k1_scalar *nonce, int *recid);
 
-#endif
+#endif /* SECP256K1_ECDSA_H */
diff --git a/src/secp256k1/src/ecdsa_impl.h b/src/secp256k1/src/ecdsa_impl.h
--- a/src/secp256k1/src/ecdsa_impl.h
+++ b/src/secp256k1/src/ecdsa_impl.h
@@ -5,8 +5,8 @@
  **********************************************************************/
 
 
-#ifndef _SECP256K1_ECDSA_IMPL_H_
-#define _SECP256K1_ECDSA_IMPL_H_
+#ifndef SECP256K1_ECDSA_IMPL_H
+#define SECP256K1_ECDSA_IMPL_H
 
 #include "scalar.h"
 #include "field.h"
@@ -312,4 +312,4 @@
     return 1;
 }
 
-#endif
+#endif /* SECP256K1_ECDSA_IMPL_H */
diff --git a/src/secp256k1/src/eckey.h b/src/secp256k1/src/eckey.h
--- a/src/secp256k1/src/eckey.h
+++ b/src/secp256k1/src/eckey.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECKEY_
-#define _SECP256K1_ECKEY_
+#ifndef SECP256K1_ECKEY_H
+#define SECP256K1_ECKEY_H
 
 #include <stddef.h>
 
@@ -22,4 +22,4 @@
 static int secp256k1_eckey_privkey_tweak_mul(secp256k1_scalar *key, const secp256k1_scalar *tweak);
 static int secp256k1_eckey_pubkey_tweak_mul(const secp256k1_ecmult_context *ctx, secp256k1_ge *key, const secp256k1_scalar *tweak);
 
-#endif
+#endif /* SECP256K1_ECKEY_H */
diff --git a/src/secp256k1/src/eckey_impl.h b/src/secp256k1/src/eckey_impl.h
--- a/src/secp256k1/src/eckey_impl.h
+++ b/src/secp256k1/src/eckey_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECKEY_IMPL_H_
-#define _SECP256K1_ECKEY_IMPL_H_
+#ifndef SECP256K1_ECKEY_IMPL_H
+#define SECP256K1_ECKEY_IMPL_H
 
 #include "eckey.h"
 
@@ -96,4 +96,4 @@
     return 1;
 }
 
-#endif
+#endif /* SECP256K1_ECKEY_IMPL_H */
diff --git a/src/secp256k1/src/ecmult.h b/src/secp256k1/src/ecmult.h
--- a/src/secp256k1/src/ecmult.h
+++ b/src/secp256k1/src/ecmult.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_
-#define _SECP256K1_ECMULT_
+#ifndef SECP256K1_ECMULT_H
+#define SECP256K1_ECMULT_H
 
 #include "num.h"
 #include "group.h"
@@ -28,4 +28,4 @@
 /** Double multiply: R = na*A + ng*G */
 static void secp256k1_ecmult(const secp256k1_ecmult_context *ctx, secp256k1_gej *r, const secp256k1_gej *a, const secp256k1_scalar *na, const secp256k1_scalar *ng);
 
-#endif
+#endif /* SECP256K1_ECMULT_H */
diff --git a/src/secp256k1/src/ecmult_const.h b/src/secp256k1/src/ecmult_const.h
--- a/src/secp256k1/src/ecmult_const.h
+++ b/src/secp256k1/src/ecmult_const.h
@@ -4,12 +4,12 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_CONST_
-#define _SECP256K1_ECMULT_CONST_
+#ifndef SECP256K1_ECMULT_CONST_H
+#define SECP256K1_ECMULT_CONST_H
 
 #include "scalar.h"
 #include "group.h"
 
 static void secp256k1_ecmult_const(secp256k1_gej *r, const secp256k1_ge *a, const secp256k1_scalar *q);
 
-#endif
+#endif /* SECP256K1_ECMULT_CONST_H */
diff --git a/src/secp256k1/src/ecmult_const_impl.h b/src/secp256k1/src/ecmult_const_impl.h
--- a/src/secp256k1/src/ecmult_const_impl.h
+++ b/src/secp256k1/src/ecmult_const_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_CONST_IMPL_
-#define _SECP256K1_ECMULT_CONST_IMPL_
+#ifndef SECP256K1_ECMULT_CONST_IMPL_H
+#define SECP256K1_ECMULT_CONST_IMPL_H
 
 #include "scalar.h"
 #include "group.h"
@@ -236,4 +236,4 @@
     }
 }
 
-#endif
+#endif /* SECP256K1_ECMULT_CONST_IMPL_H */
diff --git a/src/secp256k1/src/ecmult_gen.h b/src/secp256k1/src/ecmult_gen.h
--- a/src/secp256k1/src/ecmult_gen.h
+++ b/src/secp256k1/src/ecmult_gen.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_GEN_
-#define _SECP256K1_ECMULT_GEN_
+#ifndef SECP256K1_ECMULT_GEN_H
+#define SECP256K1_ECMULT_GEN_H
 
 #include "scalar.h"
 #include "group.h"
@@ -40,4 +40,4 @@
 
 static void secp256k1_ecmult_gen_blind(secp256k1_ecmult_gen_context *ctx, const unsigned char *seed32);
 
-#endif
+#endif /* SECP256K1_ECMULT_GEN_H */
diff --git a/src/secp256k1/src/ecmult_gen_impl.h b/src/secp256k1/src/ecmult_gen_impl.h
--- a/src/secp256k1/src/ecmult_gen_impl.h
+++ b/src/secp256k1/src/ecmult_gen_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_GEN_IMPL_H_
-#define _SECP256K1_ECMULT_GEN_IMPL_H_
+#ifndef SECP256K1_ECMULT_GEN_IMPL_H
+#define SECP256K1_ECMULT_GEN_IMPL_H
 
 #include "scalar.h"
 #include "group.h"
@@ -207,4 +207,4 @@
     secp256k1_gej_clear(&gb);
 }
 
-#endif
+#endif /* SECP256K1_ECMULT_GEN_IMPL_H */
diff --git a/src/secp256k1/src/ecmult_impl.h b/src/secp256k1/src/ecmult_impl.h
--- a/src/secp256k1/src/ecmult_impl.h
+++ b/src/secp256k1/src/ecmult_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_ECMULT_IMPL_H_
-#define _SECP256K1_ECMULT_IMPL_H_
+#ifndef SECP256K1_ECMULT_IMPL_H
+#define SECP256K1_ECMULT_IMPL_H
 
 #include <string.h>
 
@@ -403,4 +403,4 @@
     }
 }
 
-#endif
+#endif /* SECP256K1_ECMULT_IMPL_H */
diff --git a/src/secp256k1/src/field.h b/src/secp256k1/src/field.h
--- a/src/secp256k1/src/field.h
+++ b/src/secp256k1/src/field.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_
-#define _SECP256K1_FIELD_
+#ifndef SECP256K1_FIELD_H
+#define SECP256K1_FIELD_H
 
 /** Field element module.
  *
@@ -129,4 +129,4 @@
 /** If flag is true, set *r equal to *a; otherwise leave it. Constant-time. */
 static void secp256k1_fe_cmov(secp256k1_fe *r, const secp256k1_fe *a, int flag);
 
-#endif
+#endif /* SECP256K1_FIELD_H */
diff --git a/src/secp256k1/src/field_10x26.h b/src/secp256k1/src/field_10x26.h
--- a/src/secp256k1/src/field_10x26.h
+++ b/src/secp256k1/src/field_10x26.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_
-#define _SECP256K1_FIELD_REPR_
+#ifndef SECP256K1_FIELD_REPR_H
+#define SECP256K1_FIELD_REPR_H
 
 #include <stdint.h>
 
@@ -44,4 +44,5 @@
 
 #define SECP256K1_FE_STORAGE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}
 #define SECP256K1_FE_STORAGE_CONST_GET(d) d.n[7], d.n[6], d.n[5], d.n[4],d.n[3], d.n[2], d.n[1], d.n[0]
-#endif
+
+#endif /* SECP256K1_FIELD_REPR_H */
diff --git a/src/secp256k1/src/field_10x26_impl.h b/src/secp256k1/src/field_10x26_impl.h
--- a/src/secp256k1/src/field_10x26_impl.h
+++ b/src/secp256k1/src/field_10x26_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_IMPL_H_
-#define _SECP256K1_FIELD_REPR_IMPL_H_
+#ifndef SECP256K1_FIELD_REPR_IMPL_H
+#define SECP256K1_FIELD_REPR_IMPL_H
 
 #include "util.h"
 #include "num.h"
@@ -1158,4 +1158,4 @@
 #endif
 }
 
-#endif
+#endif /* SECP256K1_FIELD_REPR_IMPL_H */
diff --git a/src/secp256k1/src/field_5x52.h b/src/secp256k1/src/field_5x52.h
--- a/src/secp256k1/src/field_5x52.h
+++ b/src/secp256k1/src/field_5x52.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_
-#define _SECP256K1_FIELD_REPR_
+#ifndef SECP256K1_FIELD_REPR_H
+#define SECP256K1_FIELD_REPR_H
 
 #include <stdint.h>
 
@@ -44,4 +44,4 @@
     (d6) | (((uint64_t)(d7)) << 32) \
 }}
 
-#endif
+#endif /* SECP256K1_FIELD_REPR_H */
diff --git a/src/secp256k1/src/field_5x52_asm_impl.h b/src/secp256k1/src/field_5x52_asm_impl.h
--- a/src/secp256k1/src/field_5x52_asm_impl.h
+++ b/src/secp256k1/src/field_5x52_asm_impl.h
@@ -11,8 +11,8 @@
  * - December 2014, Pieter Wuille: converted from YASM to GCC inline assembly
  */
 
-#ifndef _SECP256K1_FIELD_INNER5X52_IMPL_H_
-#define _SECP256K1_FIELD_INNER5X52_IMPL_H_
+#ifndef SECP256K1_FIELD_INNER5X52_IMPL_H
+#define SECP256K1_FIELD_INNER5X52_IMPL_H
 
 SECP256K1_INLINE static void secp256k1_fe_mul_inner(uint64_t *r, const uint64_t *a, const uint64_t * SECP256K1_RESTRICT b) {
 /**
@@ -499,4 +499,4 @@
 );
 }
 
-#endif
+#endif /* SECP256K1_FIELD_INNER5X52_IMPL_H */
diff --git a/src/secp256k1/src/field_5x52_impl.h b/src/secp256k1/src/field_5x52_impl.h
--- a/src/secp256k1/src/field_5x52_impl.h
+++ b/src/secp256k1/src/field_5x52_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_REPR_IMPL_H_
-#define _SECP256K1_FIELD_REPR_IMPL_H_
+#ifndef SECP256K1_FIELD_REPR_IMPL_H
+#define SECP256K1_FIELD_REPR_IMPL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -493,4 +493,4 @@
 #endif
 }
 
-#endif
+#endif /* SECP256K1_FIELD_REPR_IMPL_H */
diff --git a/src/secp256k1/src/field_5x52_int128_impl.h b/src/secp256k1/src/field_5x52_int128_impl.h
--- a/src/secp256k1/src/field_5x52_int128_impl.h
+++ b/src/secp256k1/src/field_5x52_int128_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_INNER5X52_IMPL_H_
-#define _SECP256K1_FIELD_INNER5X52_IMPL_H_
+#ifndef SECP256K1_FIELD_INNER5X52_IMPL_H
+#define SECP256K1_FIELD_INNER5X52_IMPL_H
 
 #include <stdint.h>
 
@@ -274,4 +274,4 @@
     /* [r4 r3 r2 r1 r0] = [p8 p7 p6 p5 p4 p3 p2 p1 p0] */
 }
 
-#endif
+#endif /* SECP256K1_FIELD_INNER5X52_IMPL_H */
diff --git a/src/secp256k1/src/field_impl.h b/src/secp256k1/src/field_impl.h
--- a/src/secp256k1/src/field_impl.h
+++ b/src/secp256k1/src/field_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_FIELD_IMPL_H_
-#define _SECP256K1_FIELD_IMPL_H_
+#ifndef SECP256K1_FIELD_IMPL_H
+#define SECP256K1_FIELD_IMPL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -312,4 +312,4 @@
 #endif
 }
 
-#endif
+#endif /* SECP256K1_FIELD_IMPL_H */
diff --git a/src/secp256k1/src/group.h b/src/secp256k1/src/group.h
--- a/src/secp256k1/src/group.h
+++ b/src/secp256k1/src/group.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_GROUP_
-#define _SECP256K1_GROUP_
+#ifndef SECP256K1_GROUP_H
+#define SECP256K1_GROUP_H
 
 #include "num.h"
 #include "field.h"
@@ -141,4 +141,4 @@
 /** Rescale a jacobian point by b which must be non-zero. Constant-time. */
 static void secp256k1_gej_rescale(secp256k1_gej *r, const secp256k1_fe *b);
 
-#endif
+#endif /* SECP256K1_GROUP_H */
diff --git a/src/secp256k1/src/group_impl.h b/src/secp256k1/src/group_impl.h
--- a/src/secp256k1/src/group_impl.h
+++ b/src/secp256k1/src/group_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_GROUP_IMPL_H_
-#define _SECP256K1_GROUP_IMPL_H_
+#ifndef SECP256K1_GROUP_IMPL_H
+#define SECP256K1_GROUP_IMPL_H
 
 #include "num.h"
 #include "field.h"
@@ -697,4 +697,4 @@
     return secp256k1_fe_is_quad_var(&yz);
 }
 
-#endif
+#endif /* SECP256K1_GROUP_IMPL_H */
diff --git a/src/secp256k1/src/hash.h b/src/secp256k1/src/hash.h
--- a/src/secp256k1/src/hash.h
+++ b/src/secp256k1/src/hash.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_HASH_
-#define _SECP256K1_HASH_
+#ifndef SECP256K1_HASH_H
+#define SECP256K1_HASH_H
 
 #include <stdlib.h>
 #include <stdint.h>
@@ -38,4 +38,4 @@
 static void secp256k1_rfc6979_hmac_sha256_generate(secp256k1_rfc6979_hmac_sha256_t *rng, unsigned char *out, size_t outlen);
 static void secp256k1_rfc6979_hmac_sha256_finalize(secp256k1_rfc6979_hmac_sha256_t *rng);
 
-#endif
+#endif /* SECP256K1_HASH_H */
diff --git a/src/secp256k1/src/hash_impl.h b/src/secp256k1/src/hash_impl.h
--- a/src/secp256k1/src/hash_impl.h
+++ b/src/secp256k1/src/hash_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_HASH_IMPL_H_
-#define _SECP256K1_HASH_IMPL_H_
+#ifndef SECP256K1_HASH_IMPL_H
+#define SECP256K1_HASH_IMPL_H
 
 #include "hash.h"
 
@@ -278,4 +278,4 @@
 #undef Maj
 #undef Ch
 
-#endif
+#endif /* SECP256K1_HASH_IMPL_H */
diff --git a/src/secp256k1/src/modules/ecdh/main_impl.h b/src/secp256k1/src/modules/ecdh/main_impl.h
--- a/src/secp256k1/src/modules/ecdh/main_impl.h
+++ b/src/secp256k1/src/modules/ecdh/main_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_ECDH_MAIN_
-#define _SECP256K1_MODULE_ECDH_MAIN_
+#ifndef SECP256K1_MODULE_ECDH_MAIN_H
+#define SECP256K1_MODULE_ECDH_MAIN_H
 
 #include "include/secp256k1_ecdh.h"
 #include "ecmult_const_impl.h"
@@ -51,4 +51,4 @@
     return ret;
 }
 
-#endif
+#endif /* SECP256K1_MODULE_ECDH_MAIN_H */
diff --git a/src/secp256k1/src/modules/ecdh/tests_impl.h b/src/secp256k1/src/modules/ecdh/tests_impl.h
--- a/src/secp256k1/src/modules/ecdh/tests_impl.h
+++ b/src/secp256k1/src/modules/ecdh/tests_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_ECDH_TESTS_
-#define _SECP256K1_MODULE_ECDH_TESTS_
+#ifndef SECP256K1_MODULE_ECDH_TESTS_H
+#define SECP256K1_MODULE_ECDH_TESTS_H
 
 void test_ecdh_api(void) {
     /* Setup context that just counts errors */
@@ -102,4 +102,4 @@
     test_bad_scalar();
 }
 
-#endif
+#endif /* SECP256K1_MODULE_ECDH_TESTS_H */
diff --git a/src/secp256k1/src/modules/recovery/main_impl.h b/src/secp256k1/src/modules/recovery/main_impl.h
--- a/src/secp256k1/src/modules/recovery/main_impl.h
+++ b/src/secp256k1/src/modules/recovery/main_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_RECOVERY_MAIN_
-#define _SECP256K1_MODULE_RECOVERY_MAIN_
+#ifndef SECP256K1_MODULE_RECOVERY_MAIN_H
+#define SECP256K1_MODULE_RECOVERY_MAIN_H
 
 #include "include/secp256k1_recovery.h"
 
@@ -190,4 +190,4 @@
     }
 }
 
-#endif
+#endif /* SECP256K1_MODULE_RECOVERY_MAIN_H */
diff --git a/src/secp256k1/src/modules/recovery/tests_impl.h b/src/secp256k1/src/modules/recovery/tests_impl.h
--- a/src/secp256k1/src/modules/recovery/tests_impl.h
+++ b/src/secp256k1/src/modules/recovery/tests_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_MODULE_RECOVERY_TESTS_
-#define _SECP256K1_MODULE_RECOVERY_TESTS_
+#ifndef SECP256K1_MODULE_RECOVERY_TESTS_H
+#define SECP256K1_MODULE_RECOVERY_TESTS_H
 
 static int recovery_test_nonce_function(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, const unsigned char *algo16, void *data, unsigned int counter) {
     (void) msg32;
@@ -390,4 +390,4 @@
     test_ecdsa_recovery_edge_cases();
 }
 
-#endif
+#endif /* SECP256K1_MODULE_RECOVERY_TESTS_H */
diff --git a/src/secp256k1/src/num.h b/src/secp256k1/src/num.h
--- a/src/secp256k1/src/num.h
+++ b/src/secp256k1/src/num.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_
-#define _SECP256K1_NUM_
+#ifndef SECP256K1_NUM_H
+#define SECP256K1_NUM_H
 
 #ifndef USE_NUM_NONE
 
@@ -71,4 +71,4 @@
 
 #endif
 
-#endif
+#endif /* SECP256K1_NUM_H */
diff --git a/src/secp256k1/src/num_gmp.h b/src/secp256k1/src/num_gmp.h
--- a/src/secp256k1/src/num_gmp.h
+++ b/src/secp256k1/src/num_gmp.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_REPR_
-#define _SECP256K1_NUM_REPR_
+#ifndef SECP256K1_NUM_REPR_H
+#define SECP256K1_NUM_REPR_H
 
 #include <gmp.h>
 
@@ -17,4 +17,4 @@
     int limbs;
 } secp256k1_num;
 
-#endif
+#endif /* SECP256K1_NUM_REPR_H */
diff --git a/src/secp256k1/src/num_gmp_impl.h b/src/secp256k1/src/num_gmp_impl.h
--- a/src/secp256k1/src/num_gmp_impl.h
+++ b/src/secp256k1/src/num_gmp_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_REPR_IMPL_H_
-#define _SECP256K1_NUM_REPR_IMPL_H_
+#ifndef SECP256K1_NUM_REPR_IMPL_H
+#define SECP256K1_NUM_REPR_IMPL_H
 
 #include <string.h>
 #include <stdlib.h>
@@ -285,4 +285,4 @@
     r->neg ^= 1;
 }
 
-#endif
+#endif /* SECP256K1_NUM_REPR_IMPL_H */
diff --git a/src/secp256k1/src/num_impl.h b/src/secp256k1/src/num_impl.h
--- a/src/secp256k1/src/num_impl.h
+++ b/src/secp256k1/src/num_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_NUM_IMPL_H_
-#define _SECP256K1_NUM_IMPL_H_
+#ifndef SECP256K1_NUM_IMPL_H
+#define SECP256K1_NUM_IMPL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -21,4 +21,4 @@
 #error "Please select num implementation"
 #endif
 
-#endif
+#endif /* SECP256K1_NUM_IMPL_H */
diff --git a/src/secp256k1/src/scalar.h b/src/secp256k1/src/scalar.h
--- a/src/secp256k1/src/scalar.h
+++ b/src/secp256k1/src/scalar.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_
-#define _SECP256K1_SCALAR_
+#ifndef SECP256K1_SCALAR_H
+#define SECP256K1_SCALAR_H
 
 #include "num.h"
 
@@ -103,4 +103,4 @@
 /** Multiply a and b (without taking the modulus!), divide by 2**shift, and round to the nearest integer. Shift must be at least 256. */
 static void secp256k1_scalar_mul_shift_var(secp256k1_scalar *r, const secp256k1_scalar *a, const secp256k1_scalar *b, unsigned int shift);
 
-#endif
+#endif /* SECP256K1_SCALAR_H */
diff --git a/src/secp256k1/src/scalar_4x64.h b/src/secp256k1/src/scalar_4x64.h
--- a/src/secp256k1/src/scalar_4x64.h
+++ b/src/secp256k1/src/scalar_4x64.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_
-#define _SECP256K1_SCALAR_REPR_
+#ifndef SECP256K1_SCALAR_REPR_H
+#define SECP256K1_SCALAR_REPR_H
 
 #include <stdint.h>
 
@@ -16,4 +16,4 @@
 
 #define SECP256K1_SCALAR_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{((uint64_t)(d1)) << 32 | (d0), ((uint64_t)(d3)) << 32 | (d2), ((uint64_t)(d5)) << 32 | (d4), ((uint64_t)(d7)) << 32 | (d6)}}
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_H */
diff --git a/src/secp256k1/src/scalar_4x64_impl.h b/src/secp256k1/src/scalar_4x64_impl.h
--- a/src/secp256k1/src/scalar_4x64_impl.h
+++ b/src/secp256k1/src/scalar_4x64_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_IMPL_H_
-#define _SECP256K1_SCALAR_REPR_IMPL_H_
+#ifndef SECP256K1_SCALAR_REPR_IMPL_H
+#define SECP256K1_SCALAR_REPR_IMPL_H
 
 /* Limbs of the secp256k1 order. */
 #define SECP256K1_N_0 ((uint64_t)0xBFD25E8CD0364141ULL)
@@ -946,4 +946,4 @@
     secp256k1_scalar_cadd_bit(r, 0, (l[(shift - 1) >> 6] >> ((shift - 1) & 0x3f)) & 1);
 }
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_IMPL_H */
diff --git a/src/secp256k1/src/scalar_8x32.h b/src/secp256k1/src/scalar_8x32.h
--- a/src/secp256k1/src/scalar_8x32.h
+++ b/src/secp256k1/src/scalar_8x32.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_
-#define _SECP256K1_SCALAR_REPR_
+#ifndef SECP256K1_SCALAR_REPR_H
+#define SECP256K1_SCALAR_REPR_H
 
 #include <stdint.h>
 
@@ -16,4 +16,4 @@
 
 #define SECP256K1_SCALAR_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7)}}
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_H */
diff --git a/src/secp256k1/src/scalar_8x32_impl.h b/src/secp256k1/src/scalar_8x32_impl.h
--- a/src/secp256k1/src/scalar_8x32_impl.h
+++ b/src/secp256k1/src/scalar_8x32_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_IMPL_H_
-#define _SECP256K1_SCALAR_REPR_IMPL_H_
+#ifndef SECP256K1_SCALAR_REPR_IMPL_H
+#define SECP256K1_SCALAR_REPR_IMPL_H
 
 /* Limbs of the secp256k1 order. */
 #define SECP256K1_N_0 ((uint32_t)0xD0364141UL)
@@ -718,4 +718,4 @@
     secp256k1_scalar_cadd_bit(r, 0, (l[(shift - 1) >> 5] >> ((shift - 1) & 0x1f)) & 1);
 }
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_IMPL_H */
diff --git a/src/secp256k1/src/scalar_impl.h b/src/secp256k1/src/scalar_impl.h
--- a/src/secp256k1/src/scalar_impl.h
+++ b/src/secp256k1/src/scalar_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_IMPL_H_
-#define _SECP256K1_SCALAR_IMPL_H_
+#ifndef SECP256K1_SCALAR_IMPL_H
+#define SECP256K1_SCALAR_IMPL_H
 
 #include "group.h"
 #include "scalar.h"
@@ -330,4 +330,4 @@
 #endif
 #endif
 
-#endif
+#endif /* SECP256K1_SCALAR_IMPL_H */
diff --git a/src/secp256k1/src/scalar_low.h b/src/secp256k1/src/scalar_low.h
--- a/src/secp256k1/src/scalar_low.h
+++ b/src/secp256k1/src/scalar_low.h
@@ -4,12 +4,12 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_
-#define _SECP256K1_SCALAR_REPR_
+#ifndef SECP256K1_SCALAR_REPR_H
+#define SECP256K1_SCALAR_REPR_H
 
 #include <stdint.h>
 
 /** A scalar modulo the group order of the secp256k1 curve. */
 typedef uint32_t secp256k1_scalar;
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_H */
diff --git a/src/secp256k1/src/scalar_low_impl.h b/src/secp256k1/src/scalar_low_impl.h
--- a/src/secp256k1/src/scalar_low_impl.h
+++ b/src/secp256k1/src/scalar_low_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_SCALAR_REPR_IMPL_H_
-#define _SECP256K1_SCALAR_REPR_IMPL_H_
+#ifndef SECP256K1_SCALAR_REPR_IMPL_H
+#define SECP256K1_SCALAR_REPR_IMPL_H
 
 #include "scalar.h"
 
@@ -111,4 +111,4 @@
     return *a == *b;
 }
 
-#endif
+#endif /* SECP256K1_SCALAR_REPR_IMPL_H */
diff --git a/src/secp256k1/src/testrand.h b/src/secp256k1/src/testrand.h
--- a/src/secp256k1/src/testrand.h
+++ b/src/secp256k1/src/testrand.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_TESTRAND_H_
-#define _SECP256K1_TESTRAND_H_
+#ifndef SECP256K1_TESTRAND_H
+#define SECP256K1_TESTRAND_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -35,4 +35,4 @@
 /** Generate pseudorandom bytes with long sequences of zero and one bits. */
 static void secp256k1_rand_bytes_test(unsigned char *bytes, size_t len);
 
-#endif
+#endif /* SECP256K1_TESTRAND_H */
diff --git a/src/secp256k1/src/testrand_impl.h b/src/secp256k1/src/testrand_impl.h
--- a/src/secp256k1/src/testrand_impl.h
+++ b/src/secp256k1/src/testrand_impl.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_TESTRAND_IMPL_H_
-#define _SECP256K1_TESTRAND_IMPL_H_
+#ifndef SECP256K1_TESTRAND_IMPL_H
+#define SECP256K1_TESTRAND_IMPL_H
 
 #include <stdint.h>
 #include <string.h>
@@ -107,4 +107,4 @@
     secp256k1_rand_bytes_test(b32, 32);
 }
 
-#endif
+#endif /* SECP256K1_TESTRAND_IMPL_H */
diff --git a/src/secp256k1/src/util.h b/src/secp256k1/src/util.h
--- a/src/secp256k1/src/util.h
+++ b/src/secp256k1/src/util.h
@@ -4,8 +4,8 @@
  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
  **********************************************************************/
 
-#ifndef _SECP256K1_UTIL_H_
-#define _SECP256K1_UTIL_H_
+#ifndef SECP256K1_UTIL_H
+#define SECP256K1_UTIL_H
 
 #if defined HAVE_CONFIG_H
 #include "libsecp256k1-config.h"
@@ -110,4 +110,4 @@
 SECP256K1_GNUC_EXT typedef unsigned __int128 uint128_t;
 #endif
 
-#endif
+#endif /* SECP256K1_UTIL_H */