diff --git a/include/Mixer.h b/include/Mixer.h
index 18510f3633d..8368e843405 100644
--- a/include/Mixer.h
+++ b/include/Mixer.h
@@ -421,6 +421,7 @@ class EXPORT Mixer : public QObject
 
 	friend class LmmsCore;
 	friend class MixerWorkerThread;
+	friend class ProjectRenderer;
 
 } ;
 
diff --git a/src/core/ProjectRenderer.cpp b/src/core/ProjectRenderer.cpp
index 3c16bce968e..7588401c2da 100644
--- a/src/core/ProjectRenderer.cpp
+++ b/src/core/ProjectRenderer.cpp
@@ -201,6 +201,9 @@ void ProjectRenderer::run()
 		}
 	}
 
+	// notify mixer of the end of processing
+	Engine::mixer()->stopProcessing();
+
 	Engine::getSong()->stopExport();
 
 	// if the user aborted export-process, the file has to be deleted