Index: archive/basic_binary_iprimitive.hpp
===================================================================
--- archive/basic_binary_iprimitive.hpp	(revision 85042)
+++ archive/basic_binary_iprimitive.hpp	(working copy)
@@ -178,7 +178,7 @@
             boost::serialization::throw_exception(
                 archive_exception(archive_exception::input_stream_error)
             );
-        std::memcpy(static_cast<char*>(address) + (count - s), &t, s);
+        std::memcpy(static_cast<char*>(address) + (count - s), &t, static_cast<std::size_t>(s));
     }
 }