diff --git a/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_torus_construction_helper.h b/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_torus_construction_helper.h
index ae8e7b7c23b..ad94ef60a75 100644
--- a/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_torus_construction_helper.h
+++ b/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_torus_construction_helper.h
@@ -286,13 +286,9 @@ public:
      */
     bool swap_predecessors(Event * event) const
     {
-#if 0
-        return false;
-#else
         return 
             (event->boundary_in_x() == NO_BOUNDARY &&
              event->boundary_in_y() == BEFORE_DISCONTINUITY);
-#endif
     }
     
     /*! Get the current top face. */