diff --git a/horizon/middleware/base.py b/horizon/middleware/base.py
index 8f28fe89c..8fd3c407f 100644
--- a/horizon/middleware/base.py
+++ b/horizon/middleware/base.py
@@ -106,7 +106,7 @@ class HorizonMiddleware(object):
                         }
                     )
 
-        tz = request.session.get('django_timezone')
+        tz = utils.get_timezone(request)
         if tz:
             timezone.activate(tz)