diff --git a/CGAL_ipelets/demo/CGAL_ipelets/alpha_shapes.cpp b/CGAL_ipelets/demo/CGAL_ipelets/alpha_shapes.cpp
index 8f298f093ca..defdb229844 100644
--- a/CGAL_ipelets/demo/CGAL_ipelets/alpha_shapes.cpp
+++ b/CGAL_ipelets/demo/CGAL_ipelets/alpha_shapes.cpp
@@ -20,7 +20,6 @@
 
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/CGAL_Ipelet_base.h> 
-#include <CGAL/Weighted_alpha_shape_euclidean_traits_2.h>
 #include <CGAL/Regular_triangulation_2.h>
 #include <CGAL/Constrained_Delaunay_triangulation_2.h>
 #include <CGAL/Delaunay_triangulation_2.h>
@@ -31,13 +30,12 @@
 namespace CGAL_alpha_shapes{
 
 typedef CGAL::Exact_predicates_inexact_constructions_kernel       Kernel;
-typedef CGAL::Weighted_alpha_shape_euclidean_traits_2<Kernel>     Gtw;
-typedef CGAL::Regular_triangulation_vertex_base_2<Gtw>            Rvb;
-typedef CGAL::Alpha_shape_vertex_base_2<Gtw,Rvb>                  Vb;
-typedef CGAL::Regular_triangulation_face_base_2<Gtw>              Rf;
-typedef CGAL::Alpha_shape_face_base_2<Gtw, Rf>                    Fb;
+typedef CGAL::Regular_triangulation_vertex_base_2<Kernel>         Rvb;
+typedef CGAL::Alpha_shape_vertex_base_2<Kernel,Rvb>               Vb;
+typedef CGAL::Regular_triangulation_face_base_2<Kernel>           Rf;
+typedef CGAL::Alpha_shape_face_base_2<Kernel,Rf>                  Fb;
 typedef CGAL::Triangulation_data_structure_2<Vb,Fb>               Tds;
-typedef CGAL::Regular_triangulation_2<Gtw,Tds>                    Regular;
+typedef CGAL::Regular_triangulation_2<Kernel,Tds>                 Regular;
 typedef CGAL::Alpha_shape_2<Regular>                              Alpha_shape_2;
 
 const std::string  sublabel[] = {