Index: boost/archive/basic_binary_oprimitive.hpp
===================================================================
--- boost/archive/basic_binary_oprimitive.hpp	(revision 58291)
+++ boost/archive/basic_binary_oprimitive.hpp	(working copy)
@@ -160,7 +160,7 @@
     // figure number of elements to output - round up
     count = ( count + sizeof(Elem) - 1) 
         / sizeof(Elem);
-    assert(count <= boost::integer_traits<std::streamsize>::const_max);
+    assert(count <= std::size_t(boost::integer_traits<std::streamsize>::const_max));
     std::streamsize scount = m_sb.sputn(
         static_cast<const Elem *>(address), 
         static_cast<std::streamsize>(count)
Index: boost/archive/basic_binary_iprimitive.hpp
===================================================================
--- boost/archive/basic_binary_iprimitive.hpp	(revision 58291)
+++ boost/archive/basic_binary_iprimitive.hpp	(working copy)
@@ -151,7 +151,7 @@
     std::size_t count
 ){
     // note: an optimizer should eliminate the following for char files
-    assert(count / sizeof(Elem) <= boost::integer_traits<std::streamsize>::const_max);
+    assert(static_cast<std::streamsize>(count / sizeof(Elem)) <= boost::integer_traits<std::streamsize>::const_max);
     std::streamsize s = static_cast<std::streamsize>(count / sizeof(Elem));
     std::streamsize scount = m_sb.sgetn(
         static_cast<Elem *>(address),