diff --git a/ansible/roles/neutron/tasks/rolling_upgrade.yml b/ansible/roles/neutron/tasks/rolling_upgrade.yml
index f826c6a9bb..5ed0168f7b 100644
--- a/ansible/roles/neutron/tasks/rolling_upgrade.yml
+++ b/ansible/roles/neutron/tasks/rolling_upgrade.yml
@@ -19,7 +19,7 @@
       KOLLA_UPGRADE:
       NEUTRON_DB_EXPAND:
       KOLLA_CONFIG_STRATEGY: "{{ config_strategy }}"
-      NEUTRON_ROLLING_UPGRADE_SERVICES: "{{ neutron_rolling_upgrade_services }}"
+      NEUTRON_ROLLING_UPGRADE_SERVICES: "{{ neutron_rolling_upgrade_services | join(' ') }}"
     image: "{{ neutron_server.image }}"
     labels:
       UPGRADE:
@@ -76,7 +76,7 @@
       KOLLA_UPGRADE:
       NEUTRON_DB_CONTRACT:
       KOLLA_CONFIG_STRATEGY: "{{ config_strategy }}"
-      NEUTRON_ROLLING_UPGRADE_SERVICES: "{{ neutron_rolling_upgrade_services }}"
+      NEUTRON_ROLLING_UPGRADE_SERVICES: "{{ neutron_rolling_upgrade_services | join(' ') }}"
     image: "{{ neutron_server.image }}"
     labels:
       UPGRADE: