diff --git a/django_bouncy/models.py b/django_bouncy/models.py
index 44fc79e..5029f84 100644
--- a/django_bouncy/models.py
+++ b/django_bouncy/models.py
@@ -2,7 +2,7 @@
 from __future__ import unicode_literals
 
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
+from six import python_2_unicode_compatible
 
 
 class Feedback(models.Model):
diff --git a/requirements.txt b/requirements.txt
index 30a1db9..65a5e86 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,4 @@ mock
 pyopenssl>=0.13.1
 pem>=16.0.0
 python-dateutil
+six