diff --git a/src/core/midi/MidiOss.cpp b/src/core/midi/MidiOss.cpp
index 77f324442..dddcfa12e 100644
--- a/src/core/midi/MidiOss.cpp
+++ b/src/core/midi/MidiOss.cpp
@@ -39,8 +39,10 @@ MidiOss::MidiOss() :
 {
 	// only start thread, if opening of MIDI-device is successful,
 	// otherwise isRunning()==false indicates error
-	if( m_midiDev.open( QIODevice::ReadWrite ) ||
-					m_midiDev.open( QIODevice::ReadOnly ) )
+	if( m_midiDev.open( QIODevice::ReadWrite |
+		QIODevice::Unbuffered ) ) ||
+		m_midiDev.open( QIODevice::ReadOnly |
+			QIODevice::Unbuffered ) )
 	{
 		start( QThread::LowPriority );
 	}