diff --git a/modules/openstack_project/manifests/kata_lists.pp b/modules/openstack_project/manifests/kata_lists.pp
index 3bacfba99f..a40f9b3426 100644
--- a/modules/openstack_project/manifests/kata_lists.pp
+++ b/modules/openstack_project/manifests/kata_lists.pp
@@ -4,8 +4,10 @@ class openstack_project::kata_lists(
   $listpassword = ''
 ) {
 
+  $listdomain = 'lists.katacontainers.io'
+
   class { 'mailman':
-    vhost_name => 'lists.katacontainers.io'
+    vhost_name => $listdomain,
   }
 
   Maillist {