diff --git a/Triangulation_2/include/CGAL/Constrained_triangulation_2.h b/Triangulation_2/include/CGAL/Constrained_triangulation_2.h
index 0b9d30ab66b..56f3149513e 100644
--- a/Triangulation_2/include/CGAL/Constrained_triangulation_2.h
+++ b/Triangulation_2/include/CGAL/Constrained_triangulation_2.h
@@ -40,10 +40,8 @@ struct Exact_predicates_tag{}; // to be used with filtered exact number
 
 
 template < class Gt, 
-           class Tds_ = Triangulation_data_structure_2 <
-                                                       Triangulation_vertex_base_2<Gt>,
-                                                       Constrained_triangulation_face_base_2<Gt> >,
-           class Itag_ = No_intersection_tag>
+           class Tds_ = Default ,
+           class Itag_ = Default >
 class Constrained_triangulation_2  
   : public Triangulation_2<Gt,typename Default::Get< Tds_,
                                                      Triangulation_data_structure_2 <
@@ -55,10 +53,11 @@ public:
   typedef typename Default::Get<Tds_, Triangulation_data_structure_2 <
                                         Triangulation_vertex_base_2<Gt>,
                                         Constrained_triangulation_face_base_2<Gt> > >::type Tds;
+
   typedef typename Default::Get<Itag_, No_intersection_tag>::type Itag;
 
   typedef Triangulation_2<Gt,Tds> Triangulation;
-  typedef Constrained_triangulation_2<Gt,Tds_,Itag>  Constrained_triangulation;
+  typedef Constrained_triangulation_2<Gt,Tds_,Itag_>  Constrained_triangulation;
   
   typedef typename Triangulation::Edge Edge;
   typedef typename Triangulation::Vertex Vertex;