diff --git a/Constrained_triangulation_3/test/Constrained_triangulation_3/cdt_3_from_off.cpp b/Constrained_triangulation_3/test/Constrained_triangulation_3/cdt_3_from_off.cpp
index 2b2b86d821d..ac650de2225 100644
--- a/Constrained_triangulation_3/test/Constrained_triangulation_3/cdt_3_from_off.cpp
+++ b/Constrained_triangulation_3/test/Constrained_triangulation_3/cdt_3_from_off.cpp
@@ -651,7 +651,9 @@ int merge_facets_region_growing(Mesh& mesh,
     }
   }
   if(!dump_surface_mesh_after_merge_filename.empty()) {
-    auto [corner_id_map, corner_id_map_ok] = mesh.add_property_map<vertex_descriptor, std::size_t>("v:corner_id", -1);
+    static constexpr auto max_size_t = std::numeric_limits<std::size_t>::max();
+    auto [corner_id_map, corner_id_map_ok] =
+        mesh.add_property_map<vertex_descriptor, std::size_t>("v:corner_id", max_size_t);
     assert(corner_id_map_ok);
     CGAL_USE(corner_id_map_ok);
     const auto nb_corners = CGAL::Polygon_mesh_processing::detect_corners_of_regions(