diff --git a/gtk2_ardour/editor_ops.cc b/gtk2_ardour/editor_ops.cc
index e140413e24..61633398fb 100644
--- a/gtk2_ardour/editor_ops.cc
+++ b/gtk2_ardour/editor_ops.cc
@@ -5428,6 +5428,7 @@ Editor::apply_midi_note_edit_op (MidiOperator& op, const RegionSelection& rs)
 
 	if (in_command) {
 		commit_reversible_command ();
+		_session->set_dirty ();
 	}
 }