diff --git a/Lib/test/test_compileall.py b/Lib/test/test_compileall.py
index 250d31b..a63af4c 100644
--- a/Lib/test/test_compileall.py
+++ b/Lib/test/test_compileall.py
@@ -345,7 +345,7 @@
 
     def test_invalid_arg_produces_message(self):
         out = self.assertRunOK('badfilename')
-        self.assertRegex(out, b"Can't list badfilename")
+        self.assertRegex(out, b"Can't list 'badfilename'")
 
 
 def test_main():