diff --git a/src/core/ProjectRenderer.cpp b/src/core/ProjectRenderer.cpp
index afa61c812d8..7e18a67b6b3 100644
--- a/src/core/ProjectRenderer.cpp
+++ b/src/core/ProjectRenderer.cpp
@@ -167,8 +167,8 @@ void ProjectRenderer::run()
 #endif
 #endif
 
-
 	Engine::getSong()->startExport();
+	Engine::getSong()->updateLength();
     //skip first empty buffer
     Engine::mixer()->nextBuffer();
 
diff --git a/src/core/Song.cpp b/src/core/Song.cpp
index e49eb62874b..dc61dc06386 100644
--- a/src/core/Song.cpp
+++ b/src/core/Song.cpp
@@ -555,6 +555,12 @@ void Song::updateLength()
 	for( TrackList::const_iterator it = tracks().begin();
 						it != tracks().end(); ++it )
 	{
+		if( Engine::getSong()->isExporting() &&
+				( *it )->isMuted() )
+		{
+			continue;
+		}
+
 		const tact_t cur = ( *it )->length();
 		if( cur > m_length )
 		{
diff --git a/src/core/Track.cpp b/src/core/Track.cpp
index 7acaa28f06c..6ce4445e51e 100644
--- a/src/core/Track.cpp
+++ b/src/core/Track.cpp
@@ -2421,6 +2421,12 @@ tact_t Track::length() const
 	for( tcoVector::const_iterator it = m_trackContentObjects.begin();
 				it != m_trackContentObjects.end(); ++it )
 	{
+		if( Engine::getSong()->isExporting() &&
+				( *it )->isMuted() )
+		{
+			continue;
+		}
+
 		const tick_t cur = ( *it )->endPosition();
 		if( cur > last )
 		{