diff --git a/modules/openstack_project/files/puppetmaster/groups.txt b/modules/openstack_project/files/puppetmaster/groups.txt
index 5e5674c997..c97362143a 100644
--- a/modules/openstack_project/files/puppetmaster/groups.txt
+++ b/modules/openstack_project/files/puppetmaster/groups.txt
@@ -4,7 +4,7 @@ subunit-worker ~subunit-worker\d+\.openstack\.org
 elasticsearch ~elasticsearch0[1-7]\.openstack\.org
 git-loadbalancer ~git(-fe\d+)?\.openstack\.org
 git-server ~git\d+\.openstack\.org
-zuul-merger ~zm\d+\.openstack\.org
+zuul-merger ~z[lm]\d+\.openstack\.org
 ci-backup ci-backup-*.openstack.org
 afsdb afsdb*.openstack.org
 afs afs*.*.openstack.org