diff --git a/roles/proxmox-backup/tasks/main.yml b/roles/proxmox-backup/tasks/main.yml
index 81f3a88..0ee4e60 100644
--- a/roles/proxmox-backup/tasks/main.yml
+++ b/roles/proxmox-backup/tasks/main.yml
@@ -82,5 +82,10 @@
         enabled: no
       notify: reboot
 
+- name: Set domain for ACME certificate renewals
+  command:
+    cmd: 'proxmox-backup-manager node update --acmedomain0 domain={{ interfaces | selectattr("name", "==", "lo")
+             | map(attribute="ip_addresses") | flatten | map(attribute="dns_name") | first }}'
+  changed_when: false # maybe write a proper check if certificate requests are ever ansibled
 
 - include_tasks: firewall.yml