diff --git a/GraphicsView/include/CGAL/Qt/debug_impl.h b/GraphicsView/include/CGAL/Qt/debug_impl.h
index df44a8fc80d..7454f1932fa 100644
--- a/GraphicsView/include/CGAL/Qt/debug_impl.h
+++ b/GraphicsView/include/CGAL/Qt/debug_impl.h
@@ -29,6 +29,7 @@
 #include <QDir>
 #include <iostream>
 #include <CGAL/gl.h>
+#include <qopenglfunctions.h>
 namespace CGAL {
 namespace Qt {