diff --git a/docs/conf.py b/docs/conf.py
index fcbf2fb..85077e1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -38,6 +38,7 @@ MOCK_MODULES = (
     'google.appengine.ext',
     'google.appengine.ext.webapp',
     'google.appengine.ext.webapp.util',
+    'werkzeug.local',
 )