diff --git a/inventories/z9/host_vars/dooris.yaml b/inventories/z9/host_vars/dooris.yaml
index 3f786aca..bae5bf90 100644
--- a/inventories/z9/host_vars/dooris.yaml
+++ b/inventories/z9/host_vars/dooris.yaml
@@ -2,6 +2,5 @@ dooris__hostname: "dooris.ccchh.net"
 dooris__openid_client_id: "dooris"
 dooris__ccujack_user: "dooris"
 dooris__spaceapid_user: "dooris"
-dooris__main_lock: ~ # add "Hautpraum" once we have built it
 
 certbot__acme_account_email_address: le-admin@hamburg.ccc.de
diff --git a/roles/dooris/defaults/main.yml b/roles/dooris/defaults/main.yml
new file mode 100644
index 00000000..0f292e95
--- /dev/null
+++ b/roles/dooris/defaults/main.yml
@@ -0,0 +1 @@
+dooris__main_lock: ""
diff --git a/roles/dooris/meta/argument_specs.yml b/roles/dooris/meta/argument_specs.yml
index 01f7ea29..5f66e956 100644
--- a/roles/dooris/meta/argument_specs.yml
+++ b/roles/dooris/meta/argument_specs.yml
@@ -43,7 +43,7 @@ argument_specs:
 
       dooris__main_lock:
         description: "Name or ID of the main lock whose status gets pushed to spaceapid"
-        required: true
+        required: false
         type: str
 
       dooris__acmedns: