diff --git a/ansible/site.yml b/ansible/site.yml
index 063ff87e10..70f0f83d19 100644
--- a/ansible/site.yml
+++ b/ansible/site.yml
@@ -110,6 +110,7 @@
   hosts:
     - haproxy
     - '&enable_haproxy_True'
+  serial: '{{ kolla_serial|default("0") }}'
   tags:
     - haproxy
   roles: