diff --git a/wagtail/wagtailcore/tests/test_sites.py b/wagtail/wagtailcore/tests/test_sites.py
index 6248afc7b8..0016f9db82 100644
--- a/wagtail/wagtailcore/tests/test_sites.py
+++ b/wagtail/wagtailcore/tests/test_sites.py
@@ -1,6 +1,6 @@
 from django.core.exceptions import ValidationError
-from django.test import TestCase
 from django.http.request import HttpRequest
+from django.test import TestCase
 
 from wagtail.wagtailcore.models import Page, Site