--- a/plugins/muc/mod_muc.lua	Tue Jun 16 15:13:47 2015 +0200
+++ b/plugins/muc/mod_muc.lua	Thu Jun 25 17:54:19 2015 +0200
@@ -44,11 +44,16 @@
 	return um_is_admin(jid, module.host);
 end
 
+local _set_affiliation = muc_new_room.room_mt.set_affiliation;
 local _get_affiliation = muc_new_room.room_mt.get_affiliation;
 function muclib.room_mt:get_affiliation(jid)
 	if is_admin(jid) then return "owner"; end
 	return _get_affiliation(self, jid);
 end
+function muclib.room_mt:set_affiliation(actor, jid, affiliation, callback, reason)
+	if is_admin(jid) then return nil, "modify", "not-acceptable"; end
+	return _set_affiliation(self, actor, jid, affiliation, callback, reason);
+end
 
 local function room_route_stanza(room, stanza) module:send(stanza); end
 local function room_save(room, forced)