diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 612a3fd0e0..65a76f745a 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -926,9 +926,7 @@ AudioEngine::start (bool for_latency)
 
 	}
 
-	/* XXX MIDI ports may not actually be available here yet .. */
-
-	PortManager::fill_midi_port_info ();
+	midi_info_dirty = true;
 
 	if (!for_latency) {
 		/* Call the library-wide ::init_post_engine() before emitting