fixed usage
diff --git a/tests/tests-c-compiler/check-assembly.sh b/tests/tests-c-compiler/check-assembly.sh
index de90b26..55eacd3 100755
--- a/tests/tests-c-compiler/check-assembly.sh
+++ b/tests/tests-c-compiler/check-assembly.sh
@@ -8,8 +8,8 @@
 set -e
 
 if [ "x$1" = "x" ]; then
-	echo "Usage: $0 <check-NN.c>"
-	exit
+	echo "Usage: $0 check-src/<check-NN.c>"
+	exit 1
 fi
 
 srcdir="${srcdir:-.}"