diff --git a/src/secp256k1/Makefile.am b/src/secp256k1/Makefile.am
index 36d56a9ac..84359ddb9 100644
--- a/src/secp256k1/Makefile.am
+++ b/src/secp256k1/Makefile.am
@@ -148,7 +148,7 @@ endif
 
 if USE_ECMULT_STATIC_PRECOMPUTATION
 CPPFLAGS_FOR_BUILD +=-I$(top_srcdir)
-CFLAGS_FOR_BUILD += -Wall -Wextra -Wno-unused-function
+CFLAGS_FOR_BUILD += -Wall -Wextra -Wno-unused-function -DENABLE_MODULE_MUSIG
 
 gen_context_OBJECTS = gen_context.o
 gen_context_BIN = gen_context$(BUILD_EXEEXT)