diff --git a/mistral_tempest_tests/tests/api/v2/test_tasks.py b/mistral_tempest_tests/tests/api/v2/test_tasks.py
index 8708d72..6d530ea 100644
--- a/mistral_tempest_tests/tests/api/v2/test_tasks.py
+++ b/mistral_tempest_tests/tests/api/v2/test_tasks.py
@@ -12,6 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import six
+
 from oslo_concurrency.fixture import lockutils
 from tempest.lib import decorators
 from tempest import test
@@ -94,7 +96,7 @@ class TaskTypesTestsV2(base.TestCase):
         self.assertEqual(200, resp.status)
 
         bt = body['tasks']
-        ll = [[v for k, v in d.iteritems() if 'type' in k] for d in bt]
+        ll = [[v for k, v in six.iteritems(d) if 'type' in k] for d in bt]
         types_list = [item for sublist in ll for item in sublist]
 
         self.assertIn(