dovecot - Nov 2016 - Single user to have lrw to all mailboxes

I have implemented a global acl:

* owner lrwstipkae
INBOX.Spam owner lrwstipeka
.Trash owner lrwsti
INBOX.Trash owner lrw
* user=master-user at mydomain.com lrs
* owner lrwstipkae

But the master-user then loses all other permissions on his own mailbox, he is
left only with: lrs

Any pointers on how to fix this?