diff --git a/impl/application/ocean/demo/tracking/featuretracker/win/FeatureTrackerMainWindow.h b/impl/application/ocean/demo/tracking/featuretracker/win/FeatureTrackerMainWindow.h
index 1d97f06ff..8b14456df 100644
--- a/impl/application/ocean/demo/tracking/featuretracker/win/FeatureTrackerMainWindow.h
+++ b/impl/application/ocean/demo/tracking/featuretracker/win/FeatureTrackerMainWindow.h
@@ -15,6 +15,8 @@
 #include "ocean/platform/win/ApplicationWindow.h"
 #include "ocean/platform/win/BitmapWindow.h"
 
+using namespace Ocean;
+
 /**
  * This class implements a main window.
  * @ingroup applicationdemotrackingfeaturetrackerwin