diff --git a/Lib/test/test_ucn.py b/Lib/test/test_ucn.py
index 1d303dc97d7..397d6cd45d9 100644
--- a/Lib/test/test_ucn.py
+++ b/Lib/test/test_ucn.py
@@ -147,7 +147,7 @@ class UnicodeNamesTest(unittest.TestCase):
         except MemoryError:
             raise unittest.SkipTest("not enough memory")
         self.assertEqual(len(x), len(b'\\N{SPACE}') + (_testcapi.UINT_MAX + 1))
-        self.assertRaisesRegex(UnicodeError,
+        self.assertRaisesRegexp(UnicodeError,
             'unknown Unicode character name',
             x.decode, 'unicode-escape'
         )