diff --git a/ansible/site.yml b/ansible/site.yml
index 063ff87e100548d8804f5a55b41ec85c73209cf8..70f0f83d19ad1a9e3491f73af32ecdaac6cc665f 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: