diff --git a/Arrangement_on_surface_2/demo/Arrangement_on_surface_2/GraphicsViewSegmentInput.h b/Arrangement_on_surface_2/demo/Arrangement_on_surface_2/GraphicsViewSegmentInput.h
index 527622a50c4..aecfff84d37 100644
--- a/Arrangement_on_surface_2/demo/Arrangement_on_surface_2/GraphicsViewSegmentInput.h
+++ b/Arrangement_on_surface_2/demo/Arrangement_on_surface_2/GraphicsViewSegmentInput.h
@@ -23,6 +23,7 @@
 #include <CGAL/Qt/GraphicsViewInput.h>
 #include <CGAL/Qt/Converter.h>
 #include <QGraphicsLineItem>
+#include <QGraphicsScene>
 #include <QGraphicsSceneMouseEvent>
 //#include <iostream>
 //#include "Callback.h"