diff --git a/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_arc_2l.h b/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_arc_2l.h
index 2d5a579d927..20c108b4283 100644
--- a/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_arc_2l.h
+++ b/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_arc_2l.h
@@ -905,7 +905,7 @@ public:
     
     //! write represenation to \c os
     void write(std::ostream& os) const { 
-        os << "Arc_2l(";
+        os << "Arc_2l@" << this->id() << "(";
         if (this->is_z_vertical()) {
             os << "Point_2(" << this->projected_point() << "), ";
             os << "MinPoint(" << this->ptr()->_m_min << "), ";
diff --git a/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_point_2l.h b/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_point_2l.h
index 42ea6b86c61..61e97c5932b 100644
--- a/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_point_2l.h
+++ b/Curved_kernel_via_analysis_2/include/CGAL/Curved_kernel_via_analysis_2l/Surface_point_2l.h
@@ -456,7 +456,7 @@ public:
     
     //! write represenation to \c os
     void write(std::ostream& os) const {
-        os << "Point_2l(";
+        os << "Point_2l@" << this->id() << "(";
         os << "Point2(" << this->projected_point() << ", loc=" 
            << this->location() << "), ";
         os << "Surface(" << this->surface() << ", ";