diff --git a/src/ifcgeom/kernels/cgal/CgalKernel.cpp b/src/ifcgeom/kernels/cgal/CgalKernel.cpp
index a99c09dccb..8f7eb45710 100644
--- a/src/ifcgeom/kernels/cgal/CgalKernel.cpp
+++ b/src/ifcgeom/kernels/cgal/CgalKernel.cpp
@@ -96,7 +96,9 @@ CGAL::Nef_polyhedron_3<Kernel_> ifcopenshell::geometry::utils::create_nef_polyhe
 }
 
 CGAL::Nef_polyhedron_3<Kernel_> ifcopenshell::geometry::utils::create_nef_polyhedron(CGAL::Polyhedron_3<Kernel_> &polyhedron) {
-	if (polyhedron.is_valid() && polyhedron.is_closed()) {
+	// @todo needed?
+	polyhedron.normalize_border();
+	if (polyhedron.is_valid(false, 3) && polyhedron.is_closed()) {
 		// @todo is it necessary to triangulat?
 		CGAL::Polygon_mesh_processing::triangulate_faces(polyhedron);
 		CGAL::Nef_polyhedron_3<Kernel_> nef_polyhedron;