diff --git a/tempest/common/isolated_creds.py b/tempest/common/isolated_creds.py
index 1f85872..fee1467 100644
--- a/tempest/common/isolated_creds.py
+++ b/tempest/common/isolated_creds.py
@@ -413,7 +413,7 @@
         if not self.isolated_creds:
             return
         self._clear_isolated_net_resources()
-        for creds in self.isolated_creds.itervalues():
+        for creds in six.itervalues(self.isolated_creds):
             try:
                 self.creds_client.delete_user(creds.user_id)
             except lib_exc.NotFound:
diff --git a/tempest/tests/test_tenant_isolation.py b/tempest/tests/test_tenant_isolation.py
index 1eb33a4..47e6abd 100644
--- a/tempest/tests/test_tenant_isolation.py
+++ b/tempest/tests/test_tenant_isolation.py
@@ -196,6 +196,7 @@
         # Assert that the role creation is called with the 2 specified roles
         self.assertEqual(len(calls), 2)
         args = map(lambda x: x[1], calls)
+        args = list(args)
         self.assertIn(('1234', '1234', '1234'), args)
         self.assertIn(('1234', '1234', '12345'), args)
         self.assertEqual(role_creds.username, 'fake_role_user')
@@ -237,6 +238,7 @@
         calls = user_mock.mock_calls
         self.assertEqual(len(calls), 3)
         args = map(lambda x: x[1][0], calls)
+        args = list(args)
         self.assertIn('1234', args)
         self.assertIn('12345', args)
         self.assertIn('123456', args)
@@ -244,6 +246,7 @@
         calls = tenant_mock.mock_calls
         self.assertEqual(len(calls), 3)
         args = map(lambda x: x[1][0], calls)
+        args = list(args)
         self.assertIn('1234', args)
         self.assertIn('12345', args)
         self.assertIn('123456', args)
@@ -381,6 +384,7 @@
         calls = remove_secgroup_mock.mock_calls
         self.assertEqual(len(calls), 3)
         args = map(lambda x: x[1][0], calls)
+        args = list(args)
         self.assertIn('v2.0/security-groups/sg-1234', args)
         self.assertIn('v2.0/security-groups/sg-12345', args)
         self.assertIn('v2.0/security-groups/sg-123456', args)
@@ -388,6 +392,7 @@
         calls = remove_router_interface_mock.mock_calls
         self.assertEqual(len(calls), 3)
         args = map(lambda x: x[1], calls)
+        args = list(args)
         self.assertIn(('1234', '1234'), args)
         self.assertIn(('12345', '12345'), args)
         self.assertIn(('123456', '123456'), args)
@@ -395,6 +400,7 @@
         calls = net_mock.mock_calls
         self.assertEqual(len(calls), 3)
         args = map(lambda x: x[1][0], calls)
+        args = list(args)
         self.assertIn('1234', args)
         self.assertIn('12345', args)
         self.assertIn('123456', args)
@@ -402,6 +408,7 @@
         calls = subnet_mock.mock_calls
         self.assertEqual(len(calls), 3)
         args = map(lambda x: x[1][0], calls)
+        args = list(args)
         self.assertIn('1234', args)
         self.assertIn('12345', args)
         self.assertIn('123456', args)
@@ -409,6 +416,7 @@
         calls = router_mock.mock_calls
         self.assertEqual(len(calls), 3)
         args = map(lambda x: x[1][0], calls)
+        args = list(args)
         self.assertIn('1234', args)
         self.assertIn('12345', args)
         self.assertIn('123456', args)