diff --git a/flatisfy/fetch.py b/flatisfy/fetch.py
index 9a99210..3a79b7e 100644
--- a/flatisfy/fetch.py
+++ b/flatisfy/fetch.py
@@ -3,6 +3,7 @@
 This module contains all the code related to fetching and loading flats lists.
 """
 from __future__ import absolute_import, print_function, unicode_literals
+from builtins import str
 
 import collections
 import itertools