diff --git a/src/ViewportWidget.cpp b/src/ViewportWidget.cpp
index fc3c953..ed16748 100644
--- a/src/ViewportWidget.cpp
+++ b/src/ViewportWidget.cpp
@@ -668,14 +668,11 @@ void ViewportWidget::drawSketch(const SketchFeature* sketch)
             Handle(Poly_Triangulation) triangulation = BRep_Tool::Triangulation(face, location);
 
             if (!triangulation.IsNull()) {
-                const TColgp_Array1OfPnt& nodes = triangulation->Nodes();
-                const Poly_Array1OfTriangle& triangles = triangulation->Triangles();
-
-                for (int i = 1; i <= triangles.Length(); ++i) {
-                    const Poly_Triangle& triangle = triangles(i);
-                    gp_Pnt p1 = nodes(triangle.Value(1)).Transformed(location);
-                    gp_Pnt p2 = nodes(triangle.Value(2)).Transformed(location);
-                    gp_Pnt p3 = nodes(triangle.Value(3)).Transformed(location);
+                for (int i = 1; i <= triangulation->NbTriangles(); ++i) {
+                    const Poly_Triangle& triangle = triangulation->Triangle(i);
+                    gp_Pnt p1 = triangulation->Node(triangle.Value(1)).Transformed(location);
+                    gp_Pnt p2 = triangulation->Node(triangle.Value(2)).Transformed(location);
+                    gp_Pnt p3 = triangulation->Node(triangle.Value(3)).Transformed(location);
                     faceVertices << p1.X() << p1.Y() << p1.Z();
                     faceVertices << p2.X() << p2.Y() << p2.Z();
                     faceVertices << p3.X() << p3.Y() << p3.Z();