diff --git a/include/boost/type_traits/type_with_alignment.hpp b/include/boost/type_traits/type_with_alignment.hpp
index 1281cfc..64351cc 100644
--- a/include/boost/type_traits/type_with_alignment.hpp
+++ b/include/boost/type_traits/type_with_alignment.hpp
@@ -158,7 +158,7 @@ union max_align
 #undef BOOST_TT_CHOOSE_MIN_ALIGNMENT
 #undef BOOST_TT_CHOOSE_T
 
-template<int TAlign, int Align>
+template<std::size_t TAlign, std::size_t Align>
 struct is_aligned
 {
     BOOST_STATIC_CONSTANT(bool,
@@ -189,7 +189,7 @@ struct is_pod< ::boost::detail::lower_alignment<Align> >
 
 // This alignment method originally due to Brian Parker, implemented by David
 // Abrahams, and then ported here by Doug Gregor.
-template <int Align>
+template <std::size_t Align>
 class type_with_alignment
 {
     typedef detail::lower_alignment<Align> t1;