diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index fb3d5ad970fba5..b6082cf02b18d7 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -1478,7 +1478,7 @@ class MoreColor(Color):
             class EvenMoreColor(Color, IntEnum):
                 chartruese = 7
         #
-        with self.assertRaisesRegex(ValueError, "\(.Foo., \(.pink., .black.\)\) is not a valid .*Color"):
+        with self.assertRaisesRegex(ValueError, r"\(.Foo., \(.pink., .black.\)\) is not a valid .*Color"):
             Color('Foo', ('pink', 'black'))
 
     def test_exclude_methods(self):