diff --git a/auditlog/__init__.py b/auditlog/__init__.py
index e96d652d..50e82385 100644
--- a/auditlog/__init__.py
+++ b/auditlog/__init__.py
@@ -5,5 +5,3 @@
 except DistributionNotFound:
     # package is not installed
     pass
-
-default_app_config = "auditlog.apps.AuditlogConfig"
diff --git a/auditlog_tests/__init__.py b/auditlog_tests/__init__.py
index fa615123..e69de29b 100644
--- a/auditlog_tests/__init__.py
+++ b/auditlog_tests/__init__.py
@@ -1 +0,0 @@
-default_app_config = "auditlog_tests.apps.AuditlogTestConfig"
diff --git a/auditlog_tests/tests.py b/auditlog_tests/tests.py
index d75afbe7..41d71f59 100644
--- a/auditlog_tests/tests.py
+++ b/auditlog_tests/tests.py
@@ -1,5 +1,6 @@
 import datetime
 import json
+from unittest import mock
 
 import django
 from dateutil.tz import gettz
@@ -182,7 +183,8 @@ class MiddlewareTest(TestCase):
     """
 
     def setUp(self):
-        self.middleware = AuditlogMiddleware()
+        self.get_response_mock = mock.Mock()
+        self.middleware = AuditlogMiddleware(get_response=self.get_response_mock)
         self.factory = RequestFactory()
         self.user = User.objects.create_user(
             username="test", email="test@example.com", password="top_secret"