diff --git a/zaqar/tests/unit/storage/test_impl_mongodb.py b/zaqar/tests/unit/storage/test_impl_mongodb.py
index b7ab630c3..2064e4cdb 100644
--- a/zaqar/tests/unit/storage/test_impl_mongodb.py
+++ b/zaqar/tests/unit/storage/test_impl_mongodb.py
@@ -86,7 +86,7 @@ class MongodbUtilsTest(MongodbSetupMixin, testing.TestBase):
         self.assertEqual('123/', utils.scope_queue_name(None, '123'))
 
     def test_descope_queue_name(self):
-        self.assertEqual(None, utils.descope_queue_name('/'))
+        self.assertIsNone(utils.descope_queue_name('/'))
         self.assertEqual('some-pig', utils.descope_queue_name('/some-pig'))
         self.assertEqual('some-pig',
                          utils.descope_queue_name('radiant/some-pig'))