diff --git a/Makefile b/Makefile
index 87cfc0699..557aa1cc4 100644
--- a/Makefile
+++ b/Makefile
@@ -61,7 +61,7 @@ endif
 OPTIMIZE = 1
 
 ifeq ($(OPTIMIZE), 1)
-  GLOBAL_CXXFLAGS += -O3 $(CXXLTO)
+  GLOBAL_CXXFLAGS += -O2 $(CXXLTO)
   GLOBAL_LDFLAGS += $(CXXLTO)
 else
   GLOBAL_CXXFLAGS += -O0 -U_FORTIFY_SOURCE