diff --git a/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xy_3.h b/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xy_3.h
index 2e37ff476c3..99b71db68a1 100644
--- a/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xy_3.h
+++ b/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xy_3.h
@@ -63,8 +63,8 @@ struct Exact_intersect_xy_2 <R,Cartesian_tag>
       }
 
       const Segment_2* si = boost::get<Segment_2>(&*obj);
-      p2 = s2.source();
-      q2 = s2.target();
+      p2 = si->source();
+      q2 = si->target();
 
       return boost::make_optional(variant_type(Segment_3(Point_3(p2.x(),p2.y(),0),
                                                          Point_3(q2.x(),q2.y(),0) ) ));
diff --git a/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xz_3.h b/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xz_3.h
index 9959db3355c..7d77eaae669 100644
--- a/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xz_3.h
+++ b/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_xz_3.h
@@ -62,8 +62,8 @@ struct Exact_intersect_xz_2 <R,Cartesian_tag>
       }
 
       const Segment_2* si = boost::get<Segment_2>(&*obj);
-      p2 = s2.source();
-      q2 = s2.target();
+      p2 = si->source();
+      q2 = si->target();
 
       return boost::make_optional(variant_type(Segment_3(Point_3(p2.x(),0,p2.y()),
                                                          Point_3(q2.x(),0,q2.y()) ) ));
diff --git a/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_yz_3.h b/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_yz_3.h
index 13710cbebf5..a98b74fd144 100644
--- a/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_yz_3.h
+++ b/Nef_3/include/CGAL/Nef_3/Exact_triangulation_euclidean_traits_yz_3.h
@@ -63,8 +63,8 @@ struct Exact_intersect_yz_2 <R,Cartesian_tag>
       }
 
       const Segment_2* si = boost::get<Segment_2>(&*obj);
-      p2 = s2.source();
-      q2 = s2.target();
+      p2 = si->source();
+      q2 = si->target();
 
       return boost::make_optional(variant_type(Segment_3(Point_3(0,p2.x(),p2.y()),
                                                          Point_3(0,q2.x(),q2.y()) ) ));