diff --git a/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Bisector_Linf.h b/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Bisector_Linf.h
index 4c0da8fdeee..7b7ef5129f2 100644
--- a/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Bisector_Linf.h
+++ b/Segment_Delaunay_graph_Linf_2/include/CGAL/Segment_Delaunay_graph_Linf_2/Bisector_Linf.h
@@ -369,6 +369,21 @@ private:
     // another precondition:
     // p, q may be parallel but do not have the same supporting line
 
+    Are_same_points_2 are_same_points;
+
+    bool is_psrc_qsrc =
+      are_same_points(p.source_site(), q.source_site());
+    bool is_psrc_qtrg =
+      are_same_points(p.source_site(), q.target_site());
+    bool is_mid_psrc = is_psrc_qsrc or is_psrc_qtrg;
+    bool is_ptrg_qsrc =
+      are_same_points(p.target_site(), q.source_site());
+    bool is_ptrg_qtrg =
+      are_same_points(p.target_site(), q.target_site());
+    bool is_mid_ptrg = is_ptrg_qsrc or is_ptrg_qtrg;
+
+    bool have_common_endp = is_mid_psrc or is_mid_ptrg;
+
     Are_parallel_2 are_parallel;
 
     // compute supporting lines of segments
@@ -440,18 +455,6 @@ private:
 
       // compute intersection point of two lines
       Point_2 mid;
-      Are_same_points_2 are_same_points;
-
-      bool is_psrc_qsrc =
-        are_same_points(p.source_site(), q.source_site());
-      bool is_psrc_qtrg =
-        are_same_points(p.source_site(), q.target_site());
-      bool is_mid_psrc = is_psrc_qsrc or is_psrc_qtrg;
-      bool is_ptrg_qsrc =
-        are_same_points(p.target_site(), q.source_site());
-      bool is_ptrg_qtrg =
-        are_same_points(p.target_site(), q.target_site());
-      bool is_mid_ptrg = is_ptrg_qsrc or is_ptrg_qtrg;
 
       if (is_mid_psrc) {
         mid = p.source();