diff --git a/Isosurfacing_3/include/CGAL/Cell_type.h b/Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/Cell_type.h
similarity index 100%
rename from Isosurfacing_3/include/CGAL/Cell_type.h
rename to Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/Cell_type.h