diff --git a/include/boost/type_traits/fwd.hpp b/include/boost/type_traits/fwd.hpp
index 5701f85..6c035d8 100644
--- a/include/boost/type_traits/fwd.hpp
+++ b/include/boost/type_traits/fwd.hpp
@@ -36,11 +36,11 @@
 // BOOST_HAS_TRIVIAL_DESTRUCTOR(T) should evaluate to true if ~T() has no effect
 
 #ifdef BOOST_HAS_SGI_TYPE_TRAITS
-#  define BOOST_IS_POD(T) ::boost::is_same< ::__type_traits<T>::is_POD_type, ::__true_type>::value
-#  define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) ::boost::is_same< ::__type_traits<T>::has_trivial_default_constructor, ::__true_type>::value
-#  define BOOST_HAS_TRIVIAL_COPY(T) ::boost::is_same< ::__type_traits<T>::has_trivial_copy_constructor, ::__true_type>::value
-#  define BOOST_HAS_TRIVIAL_ASSIGN(T) ::boost::is_same< ::__type_traits<T>::has_trivial_assignment_operator, ::__true_type>::value
-#  define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) ::boost::is_same< ::__type_traits<T>::has_trivial_destructor, ::__true_type>::value
+#  define BOOST_IS_POD(T) ::boost::is_same< typename ::__type_traits<T>::is_POD_type, ::__true_type>::value
+#  define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_default_constructor, ::__true_type>::value
+#  define BOOST_HAS_TRIVIAL_COPY(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_copy_constructor, ::__true_type>::value
+#  define BOOST_HAS_TRIVIAL_ASSIGN(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_assignment_operator, ::__true_type>::value
+#  define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_destructor, ::__true_type>::value
 #endif
 
 #ifndef BOOST_IS_CLASS