diff --git a/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Oriented_side_of_bisector_C2.h b/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Oriented_side_of_bisector_C2.h
index 0bf778484a6..8db72571b0b 100644
--- a/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Oriented_side_of_bisector_C2.h
+++ b/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Oriented_side_of_bisector_C2.h
@@ -243,6 +243,9 @@ private:
       }
     }
 
+    CGAL_SDG_DEBUG(std::cout << "debug compare_distances_ss "
+        << " idx=" << idx1 << " idx2=" << idx2 << std::endl;);
+
     CGAL_assertion( idx1 >= -1 && idx1 <= 1 );
     CGAL_assertion( idx2 >= -1 && idx2 <= 1 );