diff --git a/graphene_django/tests/models.py b/graphene_django/tests/models.py
index 957d356..f54575f 100644
--- a/graphene_django/tests/models.py
+++ b/graphene_django/tests/models.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 from __future__ import absolute_import
 
 from django.db import models