diff --git a/gtk2_ardour/midi_tracer.cc b/gtk2_ardour/midi_tracer.cc
index bd406b06e4..850f77d0c3 100644
--- a/gtk2_ardour/midi_tracer.cc
+++ b/gtk2_ardour/midi_tracer.cc
@@ -66,7 +66,7 @@ MidiTracer::MidiTracer ()
 	g_atomic_int_set (&_update_queued, 0);
 
 	std::string portname (string_compose(X_("MIDI Tracer %1"), ++window_count));
-	tracer_port = ARDOUR::AudioEngine::instance()->register_input_port (ARDOUR::DataType::MIDI, portname, false, ARDOUR::PortFlags::IsInput);
+	tracer_port = ARDOUR::AudioEngine::instance()->register_input_port (ARDOUR::DataType::MIDI, portname, false, ARDOUR::IsInput);
 
 	ARDOUR::AudioEngine::instance()->PortRegisteredOrUnregistered.connect
 		(_manager_connection, invalidator (*this), boost::bind (&MidiTracer::ports_changed, this), gui_context());