diff --git a/Makefile b/Makefile
index 3cce09b..1959c00 100644
--- a/Makefile
+++ b/Makefile
@@ -17,5 +17,5 @@ clean:
 distclean: clean
 
 test: $(BIN)
-	sipsi-8.py $<
+	sipsi-8.py $< 900
 	chip8 $<