diff --git a/tests/timezones/tests.py b/tests/timezones/tests.py
index a091681929e..30878e0d301 100644
--- a/tests/timezones/tests.py
+++ b/tests/timezones/tests.py
@@ -1173,9 +1173,10 @@ class AdminTests(TestCase):
         # password = "secret"
         cls.u1 = User.objects.create(
             id=100, password='sha1$995a3$6011485ea3834267d719b4c801409b8b1ddd0158',
-            last_login=datetime.datetime(2007, 5, 30, 13, 20, 10), is_superuser=True, username='super',
-            first_name='Super', last_name='User', email='super@example.com',
-            is_staff=True, is_active=True, date_joined=datetime.datetime(2007, 5, 30, 13, 20, 10)
+            last_login=datetime.datetime(2007, 5, 30, 13, 20, 10, tzinfo=UTC),
+            is_superuser=True, username='super', first_name='Super', last_name='User',
+            email='super@example.com', is_staff=True, is_active=True,
+            date_joined=datetime.datetime(2007, 5, 30, 13, 20, 10, tzinfo=UTC),
         )
 
     def setUp(self):