diff --git a/bin/tests/system/ifconfig.sh b/bin/tests/system/ifconfig.sh
index 9f82bff169..ee94904419 100644
--- a/bin/tests/system/ifconfig.sh
+++ b/bin/tests/system/ifconfig.sh
@@ -92,4 +92,8 @@ case "$1" in
 		esac
 	done
 	;;
+
+	*)
+		echo "Usage: $0 {start|stop}"
+		exit 1
 esac