diff --git a/certbot/tests/error_handler_test.py b/certbot/tests/error_handler_test.py
index 6cbc3c1fe..58bc4850c 100644
--- a/certbot/tests/error_handler_test.py
+++ b/certbot/tests/error_handler_test.py
@@ -1,9 +1,9 @@
 """Tests for certbot.error_handler."""
+import contextlib
 import os
 import signal
 import sys
 import unittest
-import contextlib
 
 import mock