--- a/src/Makefile
+++ b/src/Makefile
@@ -111,7 +111,7 @@ ifeq ($(notdir $(CC)),g++)
 ifeq ($(OS),Darwin)
 OPT_CFLAGS = -O2 -mtune=generic
 else
-OPT_CFLAGS = -O2 -fno-ipa-sra -mtune=generic
+OPT_CFLAGS = -fno-ipa-sra
 endif
 else
 ifeq ($(notdir $(CC)),icpc)
