diff --git a/src/dialogs.py b/src/dialogs.py
index 7e60a9f74..c1bb78d44 100644
--- a/src/dialogs.py
+++ b/src/dialogs.py
@@ -3261,7 +3261,7 @@ class TransformChatToMUC:
 			for jid in gajim.contacts.get_jid_list(account):
 				contact = \
 					gajim.contacts.get_contact_with_highest_priority(account, jid)
-				contact_transport = gajim.get_transport_name_from_jid(jid)
+				contact_transport = contact.is_transport()
 				if contact.jid not in self.auto_jids and \
 					not contact_transport and \
 					contact.jid not in gajim.interface.minimized_controls[account]: