diff --git a/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSFaceBase_2.h b/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSFaceBase_2.h
index e7d84bb4372..49e443f293d 100644
--- a/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSFaceBase_2.h
+++ b/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSFaceBase_2.h
@@ -74,9 +74,8 @@ This nested template class has to define a type `Other` which is the
 This type `Other` will be the actual base 
 of the class `CGAL::Triangulation_data_structure_2::Face`. 
 */ 
-typedef Hidden_type 
 template <typename TDS2> 
-struct Rebind_TDS; 
+struct Rebind_TDS {};
 
 /*! 
 
diff --git a/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSVertexBase_2.h b/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSVertexBase_2.h
index 6aec7130982..c55f9c10894 100644
--- a/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSVertexBase_2.h
+++ b/Triangulation_2/doc/TDS_2/Concepts/TriangulationDSVertexBase_2.h
@@ -72,9 +72,8 @@ This nested template class has to define a type `Other` which is the
 This type `Other` will be the actual base 
 of the class `CGAL::Triangulation_data_structure_2::Vertex`. 
 */ 
-typedef Hidden_type 
 template <typename TDS2> 
-struct Rebind_TDS; 
+struct Rebind_TDS {};
 
 /*! 
 
diff --git a/Triangulation_2/doc/TDS_2/Concepts/TriangulationDataStructure_2.h b/Triangulation_2/doc/TDS_2/Concepts/TriangulationDataStructure_2.h
index 333d3333085..1001eee44af 100644
--- a/Triangulation_2/doc/TDS_2/Concepts/TriangulationDataStructure_2.h
+++ b/Triangulation_2/doc/TDS_2/Concepts/TriangulationDataStructure_2.h
@@ -395,7 +395,8 @@ data structure that only changes the vertex type. It has to define a type
 `Other` which is a <I>rebound</I> triangulation data structure, that is, the 
 one whose `TriangulationDSVertexBase_2` will be `Vb2`. 
 */ 
-typedef Hidden_type template <typename Vb2> struct Rebind_vertex; 
+template <typename Vb2> 
+struct Rebind_vertex {};
 
 /*! 
 This nested template class allows to get the type of a triangulation 
@@ -403,7 +404,8 @@ data structure that only changes the face type. It has to define a type
 `Other` which is a <I>rebound</I> triangulation data structure, that is, the 
 one whose `TriangulationDSFaceBase_2` will be `Fb2`. 
 */ 
-typedef Hidden_type template <typename Fb2> struct Rebind_face; 
+template <typename Fb2> 
+struct Rebind_face {};
 
 /*! 
 The edge type.