diff --git a/Makefile b/Makefile
index 648b2eb..b625336 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+.FAKE : all test clean
+
 all : rickroll.xex
 
 # reminder: $< is input
@@ -9,8 +11,11 @@ all : rickroll.xex
 %.o : %.s
 	ca65 -v -t atari -o $@ $<
 
-%.xex : %.o mono8.o atari-asm-xex.cfg
-	ld65 -v -C ./atari-asm-xex.cfg -o $@ mono8.o $<
+%.xex : %.o mono16.o atari-asm-xex.cfg
+	ld65 -v -C ./atari-asm-xex.cfg -o $@ mono16.o $<
+
+test : all
+	atari800 rickroll.xex
 
 clean :
 	rm -f *.xex
diff --git a/mono8.s b/mono16.s
similarity index 100%
rename from mono8.s
rename to mono16.s