diff --git a/include/boost/variant/detail/variant_io.hpp b/include/boost/variant/detail/variant_io.hpp
index 9e476ed..4aa653d 100644
--- a/include/boost/variant/detail/variant_io.hpp
+++ b/include/boost/variant/detail/variant_io.hpp
@@ -3,8 +3,8 @@
 // See http://www.boost.org for updates, documentation, and revision history.
 //-----------------------------------------------------------------------------
 //
-// Copyright (c) 2003
-// Eric Friedman
+// Copyright (c) 2002-2003
+// Eric Friedman, Itay Maman
 //
 // Permission to use, copy, modify, distribute and sell this software
 // and its documentation for any purpose is hereby granted without fee, 
@@ -19,6 +19,8 @@
 
 #include <iosfwd> // for std::basic_ostream forward declare
 
+#include "boost/variant/variant_fwd.hpp"
+
 #include "boost/detail/templated_streams.hpp"
 #include "boost/variant/static_visitor.hpp"