diff --git a/xmpp/handlers.go b/xmpp/handlers.go
index ff8fb21..cfa6226 100644
--- a/xmpp/handlers.go
+++ b/xmpp/handlers.go
@@ -448,7 +448,7 @@ func handleMUCPresence(s xmpp.Sender, p stanza.Presence, mucExt stanza.MucPresen
 
 			session, ok := sessions[fromBare]
 			if !ok || !session.Session.MUC {
-				presenceReplySetError(reply, 401)
+				presenceReplySetError(reply, 407)
 				return
 			}
 
@@ -790,9 +790,9 @@ func presenceReplySetError(reply *stanza.Presence, code int) {
 	case 400:
 		reply.Error.Type = stanza.ErrorTypeModify
 		reply.Error.Reason = "jid-malformed"
-	case 401:
+	case 407:
 		reply.Error.Type = stanza.ErrorTypeAuth
-		reply.Error.Reason = "not-authorized"
+		reply.Error.Reason = "registration-required"
 	case 404:
 		reply.Error.Type = stanza.ErrorTypeCancel
 		reply.Error.Reason = "item-not-found"