diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index b461fd0854..675950d986 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -1172,7 +1172,6 @@ class Session : public PBD::StatefulDestructible, public PBD::ScopedConnectionLi
 	MidiControlUI* midi_control_ui;
 
 	int           start_midi_thread ();
-	void          terminate_midi_thread ();
 
 	void set_play_loop (bool yn);
 	void unset_play_loop ();
diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc
index e5f4b9cd6e..3fe6925186 100644
--- a/libs/ardour/session_midi.cc
+++ b/libs/ardour/session_midi.cc
@@ -539,10 +539,6 @@ Session::mmc_step_timeout ()
 	return true;
 }
 
-/*---------------------------------------------------------------------------
-  MIDI THREAD
-  ---------------------------------------------------------------------------*/
-
 int
 Session::start_midi_thread ()
 {
@@ -551,12 +547,3 @@ Session::start_midi_thread ()
 	return 0;
 }
 
-void
-Session::terminate_midi_thread ()
-{
-	if (midi_control_ui) {
-		midi_control_ui->quit ();
-	}
-}
-
-