diff --git a/Makefile b/Makefile
index cce723ca..4ce64736 100644
--- a/Makefile
+++ b/Makefile
@@ -59,9 +59,9 @@ UNICORN_CFLAGS += -fPIC
 V ?= 0
 
 ifeq ($(UNICORN_DEBUG),yes)
-CFLAGS += -O3
-else
 CFLAGS += -g
+else
+CFLAGS += -O3
 endif
 
 ifeq ($(CROSS),)