diff --git a/Polyhedron/demo/Polyhedron/Polyhedron_demo_polyhedron_stitching_plugin.cpp b/Polyhedron/demo/Polyhedron/Polyhedron_demo_polyhedron_stitching_plugin.cpp
index 7e5ae3f0f57..d51f9b487f4 100644
--- a/Polyhedron/demo/Polyhedron/Polyhedron_demo_polyhedron_stitching_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Polyhedron_demo_polyhedron_stitching_plugin.cpp
@@ -26,6 +26,11 @@ struct Is_border {
   bool operator()(const Descriptor& d) const {
    return is_border(d,g);
   }
+
+  bool operator()(typename boost::graph_traits<G>::vertex_descriptor d) const {
+    return is_border(d,g) == boost::none;
+  }
+
 };