diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index b479d9f85e..ab32599b8f 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -7483,8 +7483,10 @@ Session::maybe_update_tempo_from_midiclock_tempo (float bpm)
 		if (fabs (metric.tempo().note_types_per_minute() - bpm) > (0.01 * metric.tempo().note_types_per_minute())) {
 			tmap->change_tempo (metric.get_editable_tempo(), Tempo (bpm, 4.0, bpm));
 			TempoMap::update (tmap);
+			return;
 		}
 	}
+	TempoMap::abort_update ();
 }
 
 void