diff --git a/inventories/chaosknoten/host_vars/lists.yaml b/inventories/chaosknoten/host_vars/lists.yaml
index 2175571..402bdce 100644
--- a/inventories/chaosknoten/host_vars/lists.yaml
+++ b/inventories/chaosknoten/host_vars/lists.yaml
@@ -5,6 +5,7 @@ certbot__version_spec: ""
 certbot__acme_account_email_address: j+letsencrypt-ccchh@jsts.xyz
 certbot__certificate_domains:
   - "lists.hamburg.ccc.de"
+certbot__http_01_port: 80
 
 nginx__version_spec: ""
 nginx__configurations: