diff --git a/Nef_3/include/CGAL/Nef_3/SNC_constructor.h b/Nef_3/include/CGAL/Nef_3/SNC_constructor.h
index 5645068d567..f0c67661879 100644
--- a/Nef_3/include/CGAL/Nef_3/SNC_constructor.h
+++ b/Nef_3/include/CGAL/Nef_3/SNC_constructor.h
@@ -29,6 +29,7 @@
 #include <CGAL/Nef_S2/SM_point_locator.h>
 #include <CGAL/Nef_3/SNC_halfedge_key.h>
 #include <CGAL/Nef_3/SNC_sphere_map.h>
+#include <CGAL/Nef_3/SNC_structure.h>
 #include <CGAL/Nef_3/SNC_intersection.h>
 #ifdef SM_VISUALIZOR
 #include <CGAL/Nef_3/SNC_SM_visualizor.h>
@@ -41,9 +42,6 @@
 
 namespace CGAL {
 
-template <typename T>
-class SNC_io_parser;
-
 template <typename Infi_box, typename Vertex_handle>
 struct Frame_point_lt {
 
diff --git a/Nef_3/include/CGAL/Nef_3/SNC_structure.h b/Nef_3/include/CGAL/Nef_3/SNC_structure.h
index c6dccf530a3..27a3c5c414d 100644
--- a/Nef_3/include/CGAL/Nef_3/SNC_structure.h
+++ b/Nef_3/include/CGAL/Nef_3/SNC_structure.h
@@ -56,6 +56,7 @@ void merge_sets( Object o1, Object o2, Hash_map& hash, Union_find& uf) {
 template <typename K, typename I, typename M> class SNC_sphere_map;
 template <typename S> class SM_decorator;
 template <typename S> class SNC_decorator;
+template <typename S> class SNC_io_parser;
 
 /*{\Manpage {SNC_structure}{Items}{Selective Nef Complex}{C}}*/