diff --git a/infrastructure-playbooks/purge-docker-cluster.yml b/infrastructure-playbooks/purge-docker-cluster.yml
index 6b0969056..ff12e2765 100644
--- a/infrastructure-playbooks/purge-docker-cluster.yml
+++ b/infrastructure-playbooks/purge-docker-cluster.yml
@@ -313,7 +313,7 @@
     setup:
     delegate_to: "{{ item }}"
     delegate_facts: True
-    with_items: "{{ groups[mon_group_name] | default('mons') }}"
+    with_items: "{{ groups.get(mon_group_name, 'mons') }}"
 
   tasks: