diff --git a/src/apps/mediaconverter/MediaConverterWindow.h b/src/apps/mediaconverter/MediaConverterWindow.h
index da140f1bfc..cb2f2eb2aa 100644
--- a/src/apps/mediaconverter/MediaConverterWindow.h
+++ b/src/apps/mediaconverter/MediaConverterWindow.h
@@ -15,6 +15,7 @@
 class BBox;
 class BButton;
 class BFilePanel;
+class BMediaFile;
 class BMenuField;
 class BSlider;
 class BStringView;