diff --git a/HACKING.rst b/HACKING.rst
index 103f8cd..fed4130 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -56,8 +56,8 @@
   import logging
   import random
   import StringIO
+  import testtools
   import time
-  import unittest
 
   import eventlet
   import webob.exc