diff --git a/gtk2_ardour/port_group.cc b/gtk2_ardour/port_group.cc
index 4cd3ba4dec..cf56c66939 100644
--- a/gtk2_ardour/port_group.cc
+++ b/gtk2_ardour/port_group.cc
@@ -716,6 +716,12 @@ PortGroupList::gather (ARDOUR::Session* session, ARDOUR::DataType type, bool inp
 		system->remove_duplicates ();
 	}
 
+#ifdef LIVETRAX
+	/* hide busses (here master bus input).
+	 * Don't allow to change connections from tracks to master.
+	 */
+	if (!inputs)
+#endif
 	add_group_if_not_empty (bus);
 	add_group_if_not_empty (track);
 	add_group_if_not_empty (sidechain);