diff --git a/Makefile.x86_64 b/Makefile.x86_64
index d806a4ed2..00967bcb6 100644
--- a/Makefile.x86_64
+++ b/Makefile.x86_64
@@ -32,10 +32,12 @@ CCOMMON_OPT += -mavx2
 FCOMMON_OPT += -mavx2
 endif
 endif
+ifndef OLDGCC
 ifdef HAVE_FMA3
 CCOMMON_OPT += -mfma
 FCOMMON_OPT += -mfma
 endif
+endif
 
 ifeq ($(CORE), SKYLAKEX)
 ifndef DYNAMIC_ARCH