diff --git a/Lib/test/test_pep646_syntax.py b/Lib/test/test_pep646_syntax.py
index def313da89a..aac089b190b 100644
--- a/Lib/test/test_pep646_syntax.py
+++ b/Lib/test/test_pep646_syntax.py
@@ -1,4 +1,5 @@
 import doctest
+import unittest
 
 doctests = """