--- /boost/function/function_template.hpp	2011-11-13 08:10:55.000000000 +0200
+++ /boost/function/function_template.hpp	2011-11-29 14:40:20.000000000 +0200
@@ -677,7 +677,7 @@
 
     vtable_type* get_vtable() const {
       return reinterpret_cast<vtable_type*>(
-               reinterpret_cast<std::size_t>(vtable) & ~static_cast<size_t>(0x01));
+               reinterpret_cast<std::size_t>(vtable) & ~static_cast<std::size_t>(0x01));
     }
 
     struct clear_type {};
@@ -911,7 +911,7 @@
         if (boost::has_trivial_copy_constructor<Functor>::value &&
             boost::has_trivial_destructor<Functor>::value &&
             detail::function::function_allows_small_object_optimization<Functor>::value)
-          value |= static_cast<size_t>(0x01);
+          value |= static_cast<std::size_t>(0x01);
         vtable = reinterpret_cast<detail::function::vtable_base *>(value);
       } else 
         vtable = 0;