diff --git a/Nef_S2/include/CGAL/Nef_polyhedron_S2.h b/Nef_S2/include/CGAL/Nef_polyhedron_S2.h
index 7a5dc5ffc9d..e4036996f70 100644
--- a/Nef_S2/include/CGAL/Nef_polyhedron_S2.h
+++ b/Nef_S2/include/CGAL/Nef_polyhedron_S2.h
@@ -375,7 +375,7 @@ public:
     SHalfedge_iterator e;
     CGAL_forall_svertices(v,D) v->mark() = false;
     CGAL_forall_sedges(e,D) e->mark() = false;
-    if ( D.has_sloop() ) D.shalfloop()->mark() = false;
+    if ( D.has_shalfloop() ) D.shalfloop()->mark() = false;
     D.simplify();
   }
 
@@ -390,7 +390,7 @@ public:
     CGAL_forall_svertices(v,D) v->mark() = true;
     CGAL_forall_sedges(e,D)    e->mark() = true;
     CGAL_forall_sfaces(f,D)    f->mark() = false;
-    if ( D.has_sloop() )       D.shalfloop()->mark() = D.shalfoop()->twin() = true;
+    if ( D.has_shalfloop() )       D.shalfloop()->mark() = D.shalfoop()->twin() = true;
     D.simplify();
   }