diff --git a/Lib/test/test_parser.py b/Lib/test/test_parser.py
index b5e90531374..e7968cc3b30 100644
--- a/Lib/test/test_parser.py
+++ b/Lib/test/test_parser.py
@@ -615,7 +615,8 @@ class ParserStackLimitTestCase(unittest.TestCase):
         rc, out, err = assert_python_failure('-c', e)
         # parsing the expression will result in an error message
         # followed by a MemoryError (see #11963)
-        self.assertEqual(err, b's_push: parser stack overflow\nMemoryError')
+        self.assertIn(b's_push: parser stack overflow', err)
+        self.assertIn(b'MemoryError', err)
 
 class STObjectTestCase(unittest.TestCase):
     """Test operations on ST objects themselves"""