diff --git a/src/BRepTools/BRepTools_GTrsfModification.cxx b/src/BRepTools/BRepTools_GTrsfModification.cxx
index 7f2d9731d6..89001ee10c 100644
--- a/src/BRepTools/BRepTools_GTrsfModification.cxx
+++ b/src/BRepTools/BRepTools_GTrsfModification.cxx
@@ -308,10 +308,15 @@ Standard_Boolean BRepTools_GTrsfModification::NewTriangulation(const TopoDS_Face
   // modify normals
   if (theTriangulation->HasNormals())
   {
-    for (Standard_Integer anInd = 1; anInd <= theTriangulation->NbTriangles(); ++anInd)
+    for (Standard_Integer anInd = 1; anInd <= theTriangulation->NbNodes(); ++anInd)
     {
       gp_Dir aNormal = theTriangulation->Normal(anInd);
-      aNormal.Transform(aGTrsf.Trsf());
+      gp_Mat aMat = aGTrsf.VectorialPart();
+      aMat.SetDiagonal(1., 1., 1.);
+      gp_Trsf aTrsf;
+      aTrsf.SetForm(gp_Rotation);
+      (gp_Mat&)aTrsf.HVectorialPart() = aMat;
+      aNormal.Transform(aTrsf);
       theTriangulation->SetNormal(anInd, aNormal);
     }
   }