diff --git a/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h b/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h
index 9abef105577..2f1f61461bf 100644
--- a/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h
+++ b/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h
@@ -52,7 +52,7 @@ namespace CGAL {
               std::back_inserter(vertex_indices));
 
     typename T::size_type n = t.number_of_vertices();
-    CGAL::Spatial_sort_traits_adapter_2<Geom_traits, const Point*> sort_traits(&(points[0]));
+    CGAL::Spatial_sort_traits_adapter_2<Geom_traits, const Point*> sort_traits(&(points[0]),t.geom_traits());
 
     spatial_sort(vertex_indices.begin(), vertex_indices.end(), sort_traits);