diff --git a/sapl/base/views.py b/sapl/base/views.py
index 3b2f79f3c..e01b6aa91 100644
--- a/sapl/base/views.py
+++ b/sapl/base/views.py
@@ -1,4 +1,5 @@
 import collections
+import itertools
 import datetime
 import logging
 import os