diff --git a/Makefile b/Makefile
index 631683e..c644800 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC=gcc
-CFLAGS=-Wall
+CFLAGS=-Wall -O2
 LDFLAGS=
 SOURCES=main.c 65816.c
 OBJECTS=$(SOURCES:.c=.o)