diff --git a/src/Makefile.am b/src/Makefile.am
index 53331ee8f..03a34a140 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -67,7 +67,7 @@ LIBBITCOIN_WALLET=libbitcoin_wallet.a
 endif
 
 $(LIBSECP256K1): $(wildcard secp256k1/src/*) $(wildcard secp256k1/include/*)
-	$(AM_V_at)$(MAKE) $(AM_MAKEFLAGS) -C $(@D) $(@F) OPTFLAGS="-O2 -march=x86-64 -g "
+	$(AM_V_at)$(MAKE) $(AM_MAKEFLAGS) -C $(@D) $(@F) OPTFLAGS="-O2 -march=x86-64 -g -DENABLE_MODULE_MUSIG"
 
 LIBSNARK_CXXFLAGS = $(AM_CXXFLAGS) $(PIC_FLAGS) -DBINARY_OUTPUT -DNO_PT_COMPRESSION=1 -fstack-protector-all
 LIBSNARK_CONFIG_FLAGS = CURVE=ALT_BN128 NO_PROCPS=1 NO_DOCS=1 STATIC=1 NO_SUPERCOP=1 FEATUREFLAGS=-DMONTGOMERY_OUTPUT NO_COPY_DEPINST=1 NO_COMPILE_LIBGTEST=1