diff --git a/tox.ini b/tox.ini
index 30fe9c5..fc16297 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,3 +28,6 @@ commands =
 [testenv:flake8]
 deps = flake8
 commands = flake8 taar
+
+[flake8]
+builtins = unicode