diff --git a/STL_Extension/include/CGAL/tags.h b/STL_Extension/include/CGAL/tags.h
index 2e5992a5be8..5628798dbac 100644
--- a/STL_Extension/include/CGAL/tags.h
+++ b/STL_Extension/include/CGAL/tags.h
@@ -26,6 +26,7 @@
 #define CGAL_TAGS_H
 
 #include <CGAL/IO/io_tags.h>
+#include <boost/config.hpp>
 
 namespace CGAL {
 
@@ -48,8 +49,10 @@ inline bool check_tag( Tag_false) {return false;}
 struct Null_tag {};
 
 struct Null_functor {
-//  typedef Null_tag result_type;
-//  typedef Null_tag second_argument_type; 
+  #if defined(BOOST_MSVC) //temporary fix for VC
+  typedef Null_tag result_type;
+  typedef Null_tag second_argument_type; 
+  #endif
 };