2 files changed, 7 insertions, 5 deletions
diff --git a/libs/ardour/ardour/midi_model.h b/libs/ardour/ardour/midi_model.h
index 5d1d605c95..9b2c66d5f0 100644
--- a/libs/ardour/ardour/midi_model.h
+++ b/libs/ardour/ardour/midi_model.h
@@ -140,7 +140,7 @@ public:
 	PBD::Signal0<void> ContentsChanged;
 
 	const MidiSource* midi_source() const { return _midi_source; }
-	void set_midi_source(MidiSource* source) { _midi_source = source; }
+	void set_midi_source (MidiSource *);
 
 	boost::shared_ptr<Evoral::Note<TimeType> > find_note (NotePtr);
 
diff --git a/libs/ardour/midi_model.cc b/libs/ardour/midi_model.cc
index bdf0516dea..566bf9d9a3 100644
--- a/libs/ardour/midi_model.cc
+++ b/libs/ardour/midi_model.cc
@@ -1125,7 +1125,9 @@ MidiModel::insert_merge_policy () const
         }
 }
                         
-
-
-
-
+void
+MidiModel::set_midi_source (MidiSource* s)
+{
+	_midi_source->invalidate ();
+	_midi_source = s;
+}