diff --git a/designate_tempest_plugin/tests/scenario/v2/test_zones.py b/designate_tempest_plugin/tests/scenario/v2/test_zones.py
index 74f9563..4e9affc 100644
--- a/designate_tempest_plugin/tests/scenario/v2/test_zones.py
+++ b/designate_tempest_plugin/tests/scenario/v2/test_zones.py
@@ -232,9 +232,9 @@
 
         LOG.info("Update Zone's TTL, wait until ACTIVE and"
                  " ensure Zone's Serial has changed")
-        updated_zone = self.client.update_zone(
-            zone['id'], ttl=dns_data_utils.rand_ttl(), wait_until='ACTIVE')[1]
-        new_serial = updated_zone['serial']
+        self.client.update_zone(
+            zone['id'], ttl=dns_data_utils.rand_ttl(), wait_until='ACTIVE')
+        new_serial = self.client.show_zone(zone['id'])[1]['serial']
         self.assertNotEqual(
             new_serial, org_serial,
             "Failed, expected behaviour is that the Designate DNS changes the"