diff --git a/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp
index 7cdc88c9a74..d1472428108 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp
@@ -799,7 +799,7 @@ public:
 
    ~Polyhedron_demo_cut_plugin();
 
-  bool applicable(QAction*) const {
+  bool applicable(QAction*) const Q_DECL_OVERRIDE{
     // returns true if one surface_mesh is in the entries
     for (int i=0; i< scene->numberOfEntries(); ++i)
     {
@@ -809,30 +809,31 @@ public:
     return false;
   }
 
-  QString name() const
+  QString name() const Q_DECL_OVERRIDE
   {
     return "cut-plugin";
   }
 
 
-   QString nameFilters() const
+   QString nameFilters() const Q_DECL_OVERRIDE
   {
     return "Segment soup file (*.polylines.txt *.cgal)";
   }
 
 
-  bool canLoad(QFileInfo) const
+  bool canLoad(QFileInfo) const Q_DECL_OVERRIDE
   {
     return false;
   }
 
-  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true)
+  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true) Q_DECL_OVERRIDE
+
   {
     ok = false;
     return QList<Scene_item*>();
   }
 
-  bool canSave(const CGAL::Three::Scene_item* item)
+  bool canSave(const CGAL::Three::Scene_item* item) Q_DECL_OVERRIDE
   {
     // This plugin supports edges items
     bool b = qobject_cast<const Scene_edges_item*>(item) != 0;
@@ -840,7 +841,7 @@ public:
   }
 
 
-  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& items)
+  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& items) Q_DECL_OVERRIDE
   {
     Scene_item* item = items.front();
     // This plugin supports edges items
@@ -859,10 +860,10 @@ public:
   }
 
   void init(QMainWindow* mainWindow, CGAL::Three::Scene_interface* scene_interface,
-            Messages_interface* m);
-  QList<QAction*> actions() const;
+            Messages_interface* m) Q_DECL_OVERRIDE;
+  QList<QAction*> actions() const Q_DECL_OVERRIDE;
 
-  bool eventFilter(QObject *, QEvent *event)
+  bool eventFilter(QObject *, QEvent *event) Q_DECL_OVERRIDE
   {
     if(!plane_item)
       return false;