diff --git a/Alpha_shapes_3/examples/Alpha_shapes_3/ex_periodic_alpha_shapes_3.cpp b/Alpha_shapes_3/examples/Alpha_shapes_3/ex_periodic_alpha_shapes_3.cpp
index 99f1dbe5b6e..9f795edf82e 100644
--- a/Alpha_shapes_3/examples/Alpha_shapes_3/ex_periodic_alpha_shapes_3.cpp
+++ b/Alpha_shapes_3/examples/Alpha_shapes_3/ex_periodic_alpha_shapes_3.cpp
@@ -1,5 +1,5 @@
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
-#include <CGAL/Periodic_3_triangulation_traits_3.h>
+#include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
 #include <CGAL/Periodic_3_Delaunay_triangulation_3.h>
 #include <CGAL/Alpha_shape_3.h>
 
@@ -8,7 +8,7 @@
 
 // Traits
 typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
-typedef CGAL::Periodic_3_triangulation_traits_3<K> PK;
+typedef CGAL::Periodic_3_Delaunay_triangulation_traits_3<K> PK;
 
 // Vertex type
 typedef CGAL::Periodic_3_triangulation_ds_vertex_base_3<> DsVb;