diff --git a/Makefile.system b/Makefile.system
index aceadf2b6..5545de1b1 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -840,11 +840,19 @@ endif
 ifndef COMMON_OPT
 ifeq ($(ARCH), arm)
 COMMON_OPT = -O3
-else
-COMMON_OPT = -O2
 endif
 endif
 
+ifndef COMMON_OPT
+ifeq ($(ARCH), arm64)
+COMMON_OPT = -O3
+endif
+endif
+
+ifndef COMMON_OPT
+COMMON_OPT = -O2
+endif
+
 
 override CFLAGS     += $(COMMON_OPT) $(CCOMMON_OPT) -I$(TOPDIR)
 override PFLAGS     += $(COMMON_OPT) $(CCOMMON_OPT) -I$(TOPDIR) -DPROFILE $(COMMON_PROF)