diff --git a/dronecan_gui_tool/setup_window.py b/dronecan_gui_tool/setup_window.py
index fdf8646..e8a3ca3 100644
--- a/dronecan_gui_tool/setup_window.py
+++ b/dronecan_gui_tool/setup_window.py
@@ -104,6 +104,7 @@ def list_ifaces():
                 out[port.description()] = port.systemLocation()
 
         mifaces = _mavcan_interfaces()
+        mifaces += ["mcast:0", "mcast:1"]
         for x in mifaces:
             out[x] = x