diff --git a/core/forks.py b/core/forks.py
index 021631ee..b9fe4edd 100644
--- a/core/forks.py
+++ b/core/forks.py
@@ -8,6 +8,7 @@ from __future__ import (
 )
 
 import requests
+import six
 from six import iteritems
 
 import core