diff --git a/scripts/build.sh b/scripts/build.sh
index 83751b69..5a615ae0 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -170,7 +170,8 @@ tools_build_muon() {
 }
 
 config_muon_default() {
-    CC="${CC}" ninja="${SAMU}" "${MUON}" setup          \
+    CC="${CC}" CFLAGS="${CFLAGS}" ninja="${SAMU}"       \
+        "${MUON}" setup                                 \
         -Ddefault_library=static                        \
         -Dc_link_args="-static"                         \
         -Djson-c=disabled                               \