diff --git a/roles/ceph-facts/tasks/facts.yml b/roles/ceph-facts/tasks/facts.yml
index d5a5aeae1..9c57a6a1f 100644
--- a/roles/ceph-facts/tasks/facts.yml
+++ b/roles/ceph-facts/tasks/facts.yml
@@ -96,7 +96,7 @@
 
     - name: set_fact _container_exec_cmd
       set_fact:
-        _container_exec_cmd: "{{ container_binary }} exec ceph-mon-{{ hostvars[groups[mon_group_name][0]]['ansible_hostname'] if running_mon is undefined else running_mon }}"
+        _container_exec_cmd: "{{ container_binary }} exec ceph-mon-{{ hostvars[groups[mon_group_name][0] if running_mon is undefined else running_mon]['ansible_hostname'] }}"
       when:
         - containerized_deployment | bool