diff --git a/include/InstrumentTrack.h b/include/InstrumentTrack.h
index 8eafc2723..ea10447c5 100644
--- a/include/InstrumentTrack.h
+++ b/include/InstrumentTrack.h
@@ -230,7 +230,6 @@ private:
 	NotePlayHandle* m_notes[NumKeys];
 	int m_runningMidiNotes[NumKeys];
 	bool m_sustainPedalPressed;
-	QMutex m_notesMutex;
 
 	bool m_silentBuffersProcessed;
 
diff --git a/src/tracks/InstrumentTrack.cpp b/src/tracks/InstrumentTrack.cpp
index 59e0d1352..b9e1e21b1 100644
--- a/src/tracks/InstrumentTrack.cpp
+++ b/src/tracks/InstrumentTrack.cpp
@@ -240,7 +240,6 @@ MidiEvent InstrumentTrack::applyMasterKey( const MidiEvent& event )
 void InstrumentTrack::processInEvent( const MidiEvent& event, const MidiTime& time, f_cnt_t offset )
 {
 	engine::mixer()->lock();
-	QMutexLocker locker( &m_notesMutex );
 	bool eventHandled = false;
 
 	switch( event.type() )