diff --git a/Segment_Delaunay_graph_Linf_2/include/CGAL/Polychain_2.h b/Segment_Delaunay_graph_Linf_2/include/CGAL/Polychain_2.h
index 542adfb98eb..6ec4a820fac 100644
--- a/Segment_Delaunay_graph_Linf_2/include/CGAL/Polychain_2.h
+++ b/Segment_Delaunay_graph_Linf_2/include/CGAL/Polychain_2.h
@@ -105,7 +105,7 @@ operator<<(std::ostream &os,
               ::Vertex_const_iterator
            i;
 
-  switch(os.iword(IO::mode)) {
+  switch(get_mode(os)) {
     case IO::ASCII :
       os << p.size() << ' ';
       for (i = p.vertices_begin(); i != p.vertices_end(); ++i) {
@@ -278,7 +278,7 @@ operator<<(std::ostream &os,
 {
   typename Polychainray_2<Traits_P,Container_P>::Vertex_const_iterator i;
 
-  switch(os.iword(IO::mode)) {
+  switch(get_mode(os)) {
     case IO::ASCII :
       os << p.size() << ' ';
       for (i = p.vertices_begin(); i != p.vertices_end(); ++i) {
@@ -794,7 +794,7 @@ operator<<(std::ostream &os,
 {
   typename Polychainline_2<Traits_P,Container_P>::Vertex_const_iterator i;
 
-  switch(os.iword(IO::mode)) {
+  switch(get_mode(os)) {
     case IO::ASCII :
       os << p.size() << ' ';
       os << ", dinc=" << p.get_incoming() << ", ";