diff --git a/playbooks/roles/os_horizon/templates/horizon_local_settings.py.j2 b/playbooks/roles/os_horizon/templates/horizon_local_settings.py.j2
index 99a4947e10..f06d653b99 100644
--- a/playbooks/roles/os_horizon/templates/horizon_local_settings.py.j2
+++ b/playbooks/roles/os_horizon/templates/horizon_local_settings.py.j2
@@ -546,7 +546,7 @@ SECURITY_GROUP_RULES = {
     },
     'dns': {
         'name': 'DNS',
-        'ip_protocol': 'tcp',
+        'ip_protocol': 'udp',
         'from_port': '53',
         'to_port': '53',
     },