diff --git a/GNUmakefile b/GNUmakefile
index b8b125f..5f2559a 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -111,7 +111,7 @@ OUTPUTS += output/pl2.txt
 wads: $(WADS)
 
 check: $(OUTPUTS)
-	@diff -x .gitignore -ur expected output && echo all tests passed
+	@diff -q -x .gitignore -ur expected output && echo all tests passed
 
 clean:
 	rm -rf output/* extract/*