diff --git a/tox.ini b/tox.ini
index 3e7ea42..4c53e70 100644
--- a/tox.ini
+++ b/tox.ini
@@ -43,6 +43,7 @@ deps =
   pytz
   requests
   pytest-freezegun
+  enum34<=1.1.6
   http://git.entrouvert.org/authentic.git/snapshot/authentic-master.tar.gz
   http://git.entrouvert.org/authentic2-auth-fc.git/snapshot/authentic2-auth-fc-master.tar.gz
 commands =