diff --git a/Arrangement_on_surface_2/include/CGAL/Arr_polycurve_basic_traits_2.h b/Arrangement_on_surface_2/include/CGAL/Arr_polycurve_basic_traits_2.h
index 5fc50e0c5fb..da39fc3a02c 100644
--- a/Arrangement_on_surface_2/include/CGAL/Arr_polycurve_basic_traits_2.h
+++ b/Arrangement_on_surface_2/include/CGAL/Arr_polycurve_basic_traits_2.h
@@ -2534,7 +2534,7 @@ protected:
       Polycurve_basic_traits_2;
 
     /*! The polycurve traits (in case it has state). */
-    const Polycurve_basic_traits_2& m_poly_traits;
+    const Polycurve_basic_traits_2 m_poly_traits;
 
     const Point_2& m_point;