diff --git a/Lib/test/support/socket_helper.py b/Lib/test/support/socket_helper.py
index b09c248cfcc..0ac84455629 100644
--- a/Lib/test/support/socket_helper.py
+++ b/Lib/test/support/socket_helper.py
@@ -2,6 +2,7 @@ import contextlib
 import errno
 import socket
 import unittest
+import sys
 
 from .. import support