diff --git a/libs/ardour/ardour/tempo.h b/libs/ardour/ardour/tempo.h
index d3c3a6340b..99dfffa81f 100644
--- a/libs/ardour/ardour/tempo.h
+++ b/libs/ardour/ardour/tempo.h
@@ -254,6 +254,7 @@ class TempoMap : public PBD::StatefulDestructible
 	int n_meters () const;
 
 	BBT_Time bbt_add (const BBT_Time& a, const BBT_Time& b, const TempoMetric& metric);
+	BBT_Time bbt_add (const BBT_Time& a, const BBT_Time& b);
 	BBT_Time bbt_subtract (const BBT_Time& a, const BBT_Time& b);
 
 	nframes_t frame_rate () const { return _frame_rate; }
diff --git a/libs/ardour/tempo.cc b/libs/ardour/tempo.cc
index 094c507dea..d7300f937b 100644
--- a/libs/ardour/tempo.cc
+++ b/libs/ardour/tempo.cc
@@ -1624,6 +1624,13 @@ TempoMap::bbt_add (const BBT_Time& a, const BBT_Time& b, const TempoMetric& /*me
 	return BBT_Time(a.bars + b.bars, a.beats + b.beats, a.ticks + b.ticks);
 }
 
+BBT_Time
+TempoMap::bbt_add (const BBT_Time& a, const BBT_Time& b)
+{
+	// FIXME: Obviously not correct!
+	return BBT_Time(a.bars + b.bars, a.beats + b.beats, a.ticks + b.ticks);
+}
+
 BBT_Time
 TempoMap::bbt_subtract (const BBT_Time& a, const BBT_Time& b)
 {