diff --git a/playbooks/ceph/validate-ceph-osds.yml b/playbooks/ceph/validate-ceph-osds.yml
index fe06f62..3d5712e 100644
--- a/playbooks/ceph/validate-ceph-osds.yml
+++ b/playbooks/ceph/validate-ceph-osds.yml
@@ -343,9 +343,14 @@
         _osds_test_up_in_result: "no-result"
         _osds_test_up_in_data: ""
 
+    - name: Set _mon_hostname fact
+      ansible.builtin.set_fact:
+        _mon_hostname: "{{ hostvars[groups[mon_group_name | default('ceph-mon')][0]]['ansible_hostname'] }}"
+      run_once: true
+
     - name: Get ceph osd tree
       community.docker.docker_container_exec:
-        container: "ceph-mon-{{ ansible_hostname }}"
+        container: "ceph-mon-{{ _mon_hostname }}"
         command: "ceph osd tree --format=json"
       register: _osds_tree_raw
       run_once: true