diff --git a/src/secp256k1/CMakeLists.txt b/src/secp256k1/CMakeLists.txt
--- a/src/secp256k1/CMakeLists.txt
+++ b/src/secp256k1/CMakeLists.txt
@@ -3,15 +3,29 @@
 cmake_minimum_required(VERSION 3.5)
 project(secp256k1)
 
+# Add path for custom modules
+set(CMAKE_MODULE_PATH
+	${CMAKE_MODULE_PATH}
+	${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/modules
+)
+
+include(AddCompilerFlags)
+
 # libsecp256k1 use a different set of flags.
 add_compiler_flags(
 	-pedantic
+	-Wall
+	-Wextra
+	-Wcast-align
+	-Wshadow
 	-Wno-unused-function
 	-Wno-overlength-strings
 )
 
 add_c_compiler_flags(
 	-std=c89
+	-Wnested-externs
+	-Wstrict-prototypes
 	-Wno-long-long
 )