diff --git a/BGL/include/CGAL/boost/graph/IO/PLY.h b/BGL/include/CGAL/boost/graph/IO/PLY.h
index ca773333875..bd2a59e9843 100644
--- a/BGL/include/CGAL/boost/graph/IO/PLY.h
+++ b/BGL/include/CGAL/boost/graph/IO/PLY.h
@@ -370,7 +370,7 @@ bool write_PLY(std::ostream& os,
 
   bool has_vcolor = !is_default_parameter<CGAL_NP_CLASS, internal_np::vertex_color_map_t>::value;
   bool has_fcolor = !is_default_parameter<CGAL_NP_CLASS, internal_np::face_color_map_t>::value;
-  constexpr bool has_vnormal = (!parameters::is_default_parameter<CGAL_NP_CLASS, internal_np::vertex_normal_map_t>::value);
+  bool has_vnormal = !is_default_parameter<CGAL_NP_CLASS, internal_np::vertex_normal_map_t>::value;
 
   VIMap vim = CGAL::get_initialized_vertex_index_map(g, np);
   Vpm vpm = choose_parameter(get_parameter(np, internal_np::vertex_point),