diff --git a/include/boost/iterator/iterator_adaptor.hpp b/include/boost/iterator/iterator_adaptor.hpp
index ed8a82f..19f6774 100644
--- a/include/boost/iterator/iterator_adaptor.hpp
+++ b/include/boost/iterator/iterator_adaptor.hpp
@@ -38,14 +38,12 @@ namespace boost
   // explicitly in order to specify that the default should be used.
   struct use_default;
   
-# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
   // the incompleteness of use_default causes massive problems for
   // is_convertible (naturally).  This workaround is fortunately not
   // needed for vc6/vc7.
   template<class To>
   struct is_convertible<use_default,To>
     : mpl::false_ {};
-# endif 
   
   namespace detail
   {