diff --git a/playbooks/roles/letsencrypt-install-txt-record/tasks/main.yaml b/playbooks/roles/letsencrypt-install-txt-record/tasks/main.yaml
index b7afad0139..c1545e06e8 100644
--- a/playbooks/roles/letsencrypt-install-txt-record/tasks/main.yaml
+++ b/playbooks/roles/letsencrypt-install-txt-record/tasks/main.yaml
@@ -4,7 +4,7 @@
 
 - name: Build key list
   set_fact:
-    acme_txt_keys: '{{ acme_txt_keys }} + {{ hostvars[item]["acme_txt_required"] | default([]) }}'
+    acme_txt_keys: '{{ acme_txt_keys + hostvars[item]["acme_txt_required"]|default([]) }}'
   with_inventory_hostnames:
     - letsencrypt:!disabled