diff --git a/Nef_2/include/CGAL/IO/Nef_polyhedron_2_PS_stream.h b/Nef_2/include/CGAL/IO/Nef_polyhedron_2_PS_stream.h
index d6f54df4099..ead2b8b1ed8 100644
--- a/Nef_2/include/CGAL/IO/Nef_polyhedron_2_PS_stream.h
+++ b/Nef_2/include/CGAL/IO/Nef_polyhedron_2_PS_stream.h
@@ -17,8 +17,8 @@
 //
 // Author(s)     : Michael Seel <seel@mpi-sb.mpg.de>
 
-#ifndef NEF_POLYHEDRON_2_PS_STREAM_H
-#define NEF_POLYHEDRON_2_PS_STREAM_H
+#ifndef CGAL_NEF_POLYHEDRON_2_PS_STREAM_H
+#define CGAL_NEF_POLYHEDRON_2_PS_STREAM_H
 
 #include <CGAL/Nef_polyhedron_2.h>
 #if CGAL_LEDA_VERSION < 500
@@ -118,4 +118,4 @@ ps_file& operator<<(ps_file& PS, const Nef_polyhedron_2<T>& P)
 
 CGAL_END_NAMESPACE
 
-#endif // NEF_POLYHEDRON_2_PS_STREAM_H
+#endif // CGAL_NEF_POLYHEDRON_2_PS_STREAM_H
diff --git a/Nef_2/include/CGAL/Nef_2/Object_index.h b/Nef_2/include/CGAL/Nef_2/Object_index.h
index 3d402550608..de7eae07b3c 100644
--- a/Nef_2/include/CGAL/Nef_2/Object_index.h
+++ b/Nef_2/include/CGAL/Nef_2/Object_index.h
@@ -17,8 +17,8 @@
 //
 // Author(s)     : Michael Seel <seel@mpi-sb.mpg.de>
 
-#ifndef OBJECT_INDEX_H
-#define OBJECT_INDEX_H
+#ifndef CGAL_NEF_2_OBJECT_INDEX_H
+#define CGAL_NEF_2_OBJECT_INDEX_H
 
 #include <CGAL/basic.h>
 #include <CGAL/Unique_hash_map.h>
@@ -54,8 +54,4 @@ public:
 
 CGAL_END_NAMESPACE
 
-#endif //OBJECT_INDEX_H
-
-
-
-
+#endif //CGAL_NEF_2_OBJECT_INDEX_H