diff --git a/libs/ardour/audioregion.cc b/libs/ardour/audioregion.cc
index 1d3032c1e0..0a141ee3fa 100644
--- a/libs/ardour/audioregion.cc
+++ b/libs/ardour/audioregion.cc
@@ -717,6 +717,7 @@ AudioRegion::set_live_state (const XMLNode& node, Change& what_changed, bool sen
 
 	if ((prop = node.property ("scale-gain")) != 0) {
 		_scale_amplitude = atof (prop->value().c_str());
+		what_changed = Change (what_changed|ScaleAmplitudeChanged);
 	} else {
 		_scale_amplitude = 1.0;
 	}