diff --git a/Lib/lib2to3/tests/test_main.py b/Lib/lib2to3/tests/test_main.py
index 86cb438e358..a498c5a0d1d 100644
--- a/Lib/lib2to3/tests/test_main.py
+++ b/Lib/lib2to3/tests/test_main.py
@@ -3,6 +3,7 @@
 import io
 import logging
 import os
+import re
 import shutil
 import sys
 import tempfile