diff --git a/include/boost/iterator/is_lvalue_iterator.hpp b/include/boost/iterator/is_lvalue_iterator.hpp
index 4938151..3beb90d 100755
--- a/include/boost/iterator/is_lvalue_iterator.hpp
+++ b/include/boost/iterator/is_lvalue_iterator.hpp
@@ -33,7 +33,7 @@ namespace detail
   template <class U>
   not_an_lvalue lvalue_preserver(U const&, ...);
   
-# define BOOST_LVALUE_PRESERVER(expr) lvalue_preserver(expr,0)
+# define BOOST_LVALUE_PRESERVER(expr) detail::lvalue_preserver(expr,0)
   
 #else