diff --git a/polymorphic/tests/__init__.py b/polymorphic/tests/__init__.py
index 32e1838..758233e 100644
--- a/polymorphic/tests/__init__.py
+++ b/polymorphic/tests/__init__.py
@@ -414,12 +414,3 @@ class SwappableModel(AbstractModel):
 
 class SwappedModel(AbstractModel):
     pass
-
-
-
-# Import tests
-from .test_admin import *
-from .test_orm import *
-from .test_multidb import *
-from .test_regression import *
-
diff --git a/polymorphic/tests/test_contrib.py b/polymorphic/tests/test_contrib.py
index 414e6bd..ae8f24a 100644
--- a/polymorphic/tests/test_contrib.py
+++ b/polymorphic/tests/test_contrib.py
@@ -1,3 +1,5 @@
+from unittest import TestCase
+
 from polymorphic.contrib.guardian import get_polymorphic_base_content_type
 from polymorphic.tests import *  # all models