diff --git a/gajim/gtk/discovery.py b/gajim/gtk/discovery.py
index 168e1ecf1..d2c0446f4 100644
--- a/gajim/gtk/discovery.py
+++ b/gajim/gtk/discovery.py
@@ -1717,7 +1717,7 @@ class MucBrowser(AgentBrowser):
         con.get_module('Bookmarks').add_bookmark(room_jid.split('@')[0],
                                                  room_jid,
                                                  False,
-                                                 ''
+                                                 '',
                                                  '')
 
         InformationDialog(