diff --git a/requirements.txt b/requirements.txt
index 9ba6331..df49472 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@
 # process, which may cause wedges in the gate later.
 
 eventlet>=0.17.4
+six>=1.9.0
diff --git a/test/__init__.py b/test/__init__.py
index f53bc5a..a940b8c 100644
--- a/test/__init__.py
+++ b/test/__init__.py
@@ -1,6 +1,6 @@
 # See http://code.google.com/p/python-nose/issues/detail?id=373
 # The code below enables nosetests to work with i18n _() blocks
 
-import __builtin__
+import six.moves.builtins as __builtin__
 
 setattr(__builtin__, '_', lambda x: x)