--- boost/date_time/time_duration.hpp	(revision 67743)
+++ boost/date_time/time_duration.hpp	(working copy)
@@ -267,7 +267,7 @@
   public:
     typedef typename base_duration::traits_type traits_type;
     explicit subsecond_duration(boost::int64_t ss) :
-      base_duration(0,0,0,ss*traits_type::res_adjust()/frac_of_second)
+      base_duration(0,0,0,ss*(traits_type::res_adjust()/frac_of_second))
     {}
   };