diff --git a/src/secp256k1/src/secp256k1.c b/src/secp256k1/src/secp256k1.c
--- a/src/secp256k1/src/secp256k1.c
+++ b/src/secp256k1/src/secp256k1.c
@@ -458,6 +458,7 @@
     secp256k1_scalar_negate(&sec, &sec);
     secp256k1_scalar_get_b32(seckey, &sec);
 
+    secp256k1_scalar_clear(&sec);
     return 1;
 }