diff --git a/Polygon_mesh_processing/include/CGAL/Hole_filling/do_not_use_DT3.h b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/do_not_use_DT3.h
similarity index 100%
rename from Polygon_mesh_processing/include/CGAL/Hole_filling/do_not_use_DT3.h
rename to Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/do_not_use_DT3.h