diff --git a/Polyhedron/demo/Polyhedron/Scene_polyhedron_item.h b/Polyhedron/demo/Polyhedron/Scene_polyhedron_item.h
index 77ff89cd058..6785166c772 100644
--- a/Polyhedron/demo/Polyhedron/Scene_polyhedron_item.h
+++ b/Polyhedron/demo/Polyhedron/Scene_polyhedron_item.h
@@ -50,7 +50,7 @@ public:
   bool isFinite() const { return true; }
   bool isEmpty() const;
   Bbox bbox() const;
-  Color_vector& color_vector() {return colors_;}
+  std::vector<QColor>& color_vector() {return colors_;}
 
 public slots:
   virtual void changed();