diff --git a/neutron_tempest_plugin/config.py b/neutron_tempest_plugin/config.py
index 36fec30..f7b4065 100644
--- a/neutron_tempest_plugin/config.py
+++ b/neutron_tempest_plugin/config.py
@@ -141,6 +141,9 @@
                      'If True, multicast test(s) will assert that multicast '
                      'traffic is not being flooded to all ports. Defaults '
                      'to False.'),
+    cfg.StrOpt('dns_domain',
+               default='openstackgate.local',
+               help='Name of internal dns zone to use in tests. '),
 ]
 
 # TODO(amuller): Redo configuration options registration as part of the planned