diff --git a/keystone/server/fernet_rotation/single.yml b/keystone/server/fernet_rotation/single.yml
index 88a7f8b..de5ca6a 100644
--- a/keystone/server/fernet_rotation/single.yml
+++ b/keystone/server/fernet_rotation/single.yml
@@ -1,10 +1,13 @@
 parameters:
+  _param:
+    fernet_rotation_driver: 'rsync'
+    credential_rotation_driver: 'rsync'
   keystone:
     server:
       tokens:
-        fernet_rotation_driver: rsync
+        fernet_rotation_driver: ${_param:fernet_rotation_driver}
       credential:
-        credential_rotation_driver: rsync
+        credential_rotation_driver: ${_param:credential_rotation_driver}
   linux:
     system:
       job: