diff --git a/include/Mixer.h b/include/Mixer.h
index bd6e5b4f8..da6df29d2 100644
--- a/include/Mixer.h
+++ b/include/Mixer.h
@@ -153,7 +153,7 @@ public:
 		}
 	} ;
 
-	void initDevices( bool renderOnly );
+	void initDevices();
 	void clear();
 
 
@@ -350,7 +350,7 @@ private:
 
 	void runChangesInModel();
 
-
+	bool m_renderOnly;
 
 	QVector<AudioPort *> m_audioPorts;
 
diff --git a/src/core/Engine.cpp b/src/core/Engine.cpp
index 44caff184..a53abbe5d 100644
--- a/src/core/Engine.cpp
+++ b/src/core/Engine.cpp
@@ -66,7 +66,7 @@ void LmmsCore::init( bool renderOnly )
 	s_projectJournal->setJournalling( true );
 
 	emit engine->initProgress(tr("Opening audio and midi devices"));
-	s_mixer->initDevices( renderOnly );
+	s_mixer->initDevices();
 
 	PresetPreviewPlayHandle::init();
 	s_dummyTC = new DummyTrackContainer;
diff --git a/src/core/Mixer.cpp b/src/core/Mixer.cpp
index 93266de72..a0fbac335 100644
--- a/src/core/Mixer.cpp
+++ b/src/core/Mixer.cpp
@@ -69,6 +69,7 @@ static __thread bool s_renderingThread;
 
 
 Mixer::Mixer( bool renderOnly ) :
+	m_renderOnly( true ),
 	m_framesPerPeriod( DEFAULT_BUFFER_SIZE ),
 	m_inputBufferRead( 0 ),
 	m_inputBufferWrite( 1 ),
@@ -201,10 +202,10 @@ Mixer::~Mixer()
 
 
 
-void Mixer::initDevices( bool renderOnly )
+void Mixer::initDevices()
 {
 	bool success_ful = false;
-	if( renderOnly ) {
+	if( m_renderOnly ) {
 		m_audioDev = new AudioDummy( success_ful, this );
 		m_audioDevName = AudioDummy::name();
 		m_midiClient = new MidiDummy;