diff --git a/tests/test_templatetags.py b/tests/test_templatetags.py
index <HASH>..<HASH> 100644
--- a/tests/test_templatetags.py
+++ b/tests/test_templatetags.py
@@ -10,6 +10,7 @@ Tests for `django-sheets` models module.
 
 import os
 import httpretty
+from io import open
 
 from django import template
 from django.test import SimpleTestCase
use io.open in tests for py<I> compat