--- boost/archive/detail/iserializer.hpp.old	2010-07-18 12:09:06.000000000 +0200
+++ boost/archive/detail/iserializer.hpp	2010-07-18 12:07:01.000000000 +0200
@@ -169,7 +169,7 @@
     const unsigned int file_version
 ) const {
     // trap case where the program cannot handle the current version
-    if(file_version > static_cast<const unsigned int>(version()))
+    if(file_version & 255 > static_cast<const unsigned int>(version()))
         boost::serialization::throw_exception(
             archive::archive_exception(
                 boost::archive::archive_exception::unsupported_class_version,