diff --git a/libs/ardour/midi_track.cc b/libs/ardour/midi_track.cc
index ce8c684e6a..0dd34d7bf6 100644
--- a/libs/ardour/midi_track.cc
+++ b/libs/ardour/midi_track.cc
@@ -253,8 +253,8 @@ MidiTrack::state(bool full_state)
 		root.add_child_nocopy (*freeze_node);
 	}
 
-	root.set_property("playback_channel-mode", get_playback_channel_mode());
-	root.set_property("capture_channel-mode", get_capture_channel_mode());
+	root.set_property("playback-channel-mode", get_playback_channel_mode());
+	root.set_property("capture-channel-mode", get_capture_channel_mode());
 	snprintf (buf, sizeof(buf), "0x%x", get_playback_channel_mask());
 	root.set_property("playback-channel-mask", std::string(buf));
 	snprintf (buf, sizeof(buf), "0x%x", get_capture_channel_mask());