diff --git a/cinder/control/backend/ceph.yml b/cinder/control/backend/ceph.yml
index 3b036d4..47846ae 100644
--- a/cinder/control/backend/ceph.yml
+++ b/cinder/control/backend/ceph.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    cinder_storage_client_key: ''
   cinder:
     controller:
       default_volume_type: standard-iops