diff --git a/vitrage_tempest_plugin/tests/common/cinder_utils.py b/vitrage_tempest_plugin/tests/common/cinder_utils.py
index 9228a84..1434b59 100644
--- a/vitrage_tempest_plugin/tests/common/cinder_utils.py
+++ b/vitrage_tempest_plugin/tests/common/cinder_utils.py
@@ -47,6 +47,6 @@ def _check_num_volumes(num_volumes=0, state=''):
     if len(TempestClients.cinder().volumes.list()) != num_volumes:
         return False
 
-    return all(volume.__dict__['status'].upper() == state.upper() and
-               len(volume.__dict__['attachments']) == 1
+    return all(vars(volume)['status'].upper() == state.upper() and
+               len(vars(volume)['attachments']) == 1
                for volume in TempestClients.cinder().volumes.list())
diff --git a/vitrage_tempest_plugin/tests/common/general_utils.py b/vitrage_tempest_plugin/tests/common/general_utils.py
index 9793b97..42c2cb3 100644
--- a/vitrage_tempest_plugin/tests/common/general_utils.py
+++ b/vitrage_tempest_plugin/tests/common/general_utils.py
@@ -32,7 +32,7 @@ def is_subset(subset, full):
         return True
     full_dict = full
     if type(full) is not dict:
-        full_dict = full.__dict__
+        full_dict = vars(full)
     return six.viewitems(subset) <= six.viewitems(full_dict)