diff --git a/flask/testsuite/ext.py b/flask/testsuite/ext.py
index 096a70f8..6f6a34f4 100644
--- a/flask/testsuite/ext.py
+++ b/flask/testsuite/ext.py
@@ -13,7 +13,7 @@ from __future__ import with_statement
 import sys
 import unittest
 from flask.testsuite import FlaskTestCase
-from six import reload_module
+from six.moves import reload_module
 
 class ExtImportHookTestCase(FlaskTestCase):