diff --git a/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_face_index_map.h b/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_face_index_map.h
index e54c6bf5abd..6351130a031 100644
--- a/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_face_index_map.h
+++ b/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_face_index_map.h
@@ -40,7 +40,7 @@ the type of the attached arrangement.
 */ 
 typedef Arrangement Arrangement_2;
 
-typedef boost::readable_property_map_tag;
+typedef boost::readable_property_map_tag category;
 
 typedef unsigned int value_type;
 
diff --git a/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_vertex_index_map.h b/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_vertex_index_map.h
index 6975b155ba0..d18ea462b03 100644
--- a/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_vertex_index_map.h
+++ b/Arrangement_on_surface_2/doc/Arrangement_on_surface_2/CGAL/Arr_vertex_index_map.h
@@ -40,7 +40,7 @@ the type of the attached arrangement.
 */ 
 typedef Arrangement Arrangement_2;
 
-typedef boost::readable_property_map_tag;
+typedef boost::readable_property_map_tag category;
 
 typedef unsigned int value_type;