diff --git a/libs/temporal/tempo.cc b/libs/temporal/tempo.cc
index ec065d46cc..c60072b7a6 100644
--- a/libs/temporal/tempo.cc
+++ b/libs/temporal/tempo.cc
@@ -567,6 +567,7 @@ TempoMapPoint::end_float ()
 /* TEMPOMAP */
 
 TempoMap::TempoMap (Tempo const & initial_tempo, Meter const & initial_meter)
+	: _time_domain (AudioTime)
 {
 	TempoPoint* tp = new TempoPoint (*this, initial_tempo, 0, Beats(), BBT_Time());
 	MeterPoint* mp = new MeterPoint (*this, initial_meter, 0, Beats(), BBT_Time());