diff --git a/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Basic_predicates_C2.h b/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Basic_predicates_C2.h
index bd3d3b9ddb0..598230aee79 100644
--- a/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Basic_predicates_C2.h
+++ b/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Basic_predicates_C2.h
@@ -1163,6 +1163,16 @@ public:
     return s.supporting_site().source_site().point().x();
   }
 
+  inline
+  static
+  RT hvseg_coord(const Site_2 & s, const bool is_hor) {
+    CGAL_assertion(s.is_segment());
+    CGAL_assertion(is_site_horizontal(s) == is_hor);
+    CGAL_assertion(is_site_vertical(s) == (not is_hor));
+    return is_hor ? s.supporting_site().source_site().point().y() :
+                    s.supporting_site().source_site().point().x() ;
+  }
+
 };