diff --git a/Arrangement_on_surface_2/include/CGAL/Arr_curve_data_traits_2.h b/Arrangement_on_surface_2/include/CGAL/Arr_curve_data_traits_2.h
index b8b5ab5c530..4789c7c08cb 100644
--- a/Arrangement_on_surface_2/include/CGAL/Arr_curve_data_traits_2.h
+++ b/Arrangement_on_surface_2/include/CGAL/Arr_curve_data_traits_2.h
@@ -415,7 +415,7 @@ public:
     template <typename GeomeTraits_2>
     typename boost::enable_if_c<!has_construct_opposite_2<GeomeTraits_2>::value,
                                 X_monotone_curve_2>::type
-    construct_opposite(const X_monotone_curve_2& cv) const
+    construct_opposite(const X_monotone_curve_2&) const
     {
       CGAL_error_msg("Construct opposite curve is not supported!");
       return X_monotone_curve_2();
diff --git a/BGL/include/CGAL/boost/graph/convert_nef_polyhedron_to_polygon_mesh.h b/BGL/include/CGAL/boost/graph/convert_nef_polyhedron_to_polygon_mesh.h
index fe65be4b6e5..0c8f9c553f9 100644
--- a/BGL/include/CGAL/boost/graph/convert_nef_polyhedron_to_polygon_mesh.h
+++ b/BGL/include/CGAL/boost/graph/convert_nef_polyhedron_to_polygon_mesh.h
@@ -96,7 +96,6 @@ struct Shell_polygons_visitor
 
   std::size_t get_cycle_length( typename Nef_polyhedron::Halffacet_cycle_const_iterator hfc) const
   {
-    typename Nef_polyhedron::SHalfedge_const_handle h(hfc);
     typename Nef_polyhedron::SHalfedge_around_facet_const_circulator hc_start(hfc), hc_end(hc_start);
     std::size_t i=0;
     CGAL_For_all(hc_start,hc_end)