diff --git a/infrastructure-playbooks/rolling_update.yml b/infrastructure-playbooks/rolling_update.yml
index 5841286fc..84f7a05d6 100644
--- a/infrastructure-playbooks/rolling_update.yml
+++ b/infrastructure-playbooks/rolling_update.yml
@@ -454,7 +454,7 @@
         - nodeep-scrub
 
 - name: upgrade ceph mdss cluster, deactivate all rank > 0
-  hosts: "{{ groups[mon_group_name|default('mons')][0] }}"
+  hosts: "{{ mon_group_name | default('mons') }}[0]"
   become: true
   tasks:
     - name: deactivate all mds rank > 0