diff --git a/hooks/ceph_hooks.py b/hooks/ceph_hooks.py
index 90f428cc..a4e1ef52 100755
--- a/hooks/ceph_hooks.py
+++ b/hooks/ceph_hooks.py
@@ -633,7 +633,8 @@ def mds_relation_joined(relid=None, unit=None):
         public_addr = get_public_addr()
         data = {
             'fsid': leader_get('fsid'),
-            'mds_key': ceph.get_mds_key(name=mds_name),
+            '{}_mds_key'.format(mds_name):
+                ceph.get_mds_key(name=mds_name),
             'auth': config('auth-supported'),
             'ceph-public-address': public_addr}
         data.update(handle_broker_request(relid, unit))