diff --git a/libs/ardour/ardour/types.h b/libs/ardour/ardour/types.h
index c7618158a0..6cabde195a 100644
--- a/libs/ardour/ardour/types.h
+++ b/libs/ardour/ardour/types.h
@@ -749,8 +749,19 @@ enum MidiPortFlags {
 };
 
 struct LatencyRange {
+	LatencyRange () : min (0), max (0) {}
+
 	uint32_t min; //< samples
 	uint32_t max; //< samples
+
+	bool operator==(const LatencyRange& other) {
+		return (min == other.min && max == other.max);
+	}
+
+	void operator=(const LatencyRange& other) {
+		min = other.min;
+		max = other.max;
+	}
 };
 
 enum BufferingPreset {
diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc
index c08abe95f5..e26fd206aa 100644
--- a/libs/ardour/session_midi.cc
+++ b/libs/ardour/session_midi.cc
@@ -409,7 +409,7 @@ Session::send_full_time_code (samplepos_t const t, MIDI::pframes_t nframes)
 	outbound_mtc_timecode_frame = mtc_tc;
 	transmitting_timecode_time = timecode;
 
-	LatencyRange mtc_out_latency = {0, 0}; // TODO cache this, update on engine().GraphReordered()
+	LatencyRange mtc_out_latency;
 	_midi_ports->mtc_output_port ()->get_connected_latency_range (ltc_out_latency, true);
 	sampleoffset_t mtc_offset = mtc_out_latency.max;