diff --git a/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp b/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp
index 8b4b38cf183..ce95162c889 100644
--- a/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp
@@ -73,6 +73,8 @@ struct Polyline_visitor
     Polyline& polyline = polylines.back();
     polyline.push_back(skeleton[vd].point);
   }
+
+  void end_polyline(){}
 };
 
 template<class ValueType>