diff --git a/include/boost/thread/xtime.hpp b/include/boost/thread/xtime.hpp
index 163d075f..e69d2d5e 100644
--- a/include/boost/thread/xtime.hpp
+++ b/include/boost/thread/xtime.hpp
@@ -33,26 +33,23 @@ enum xtime_clock_types
 struct xtime
 {
 #if defined(BOOST_NO_INT64_T)
-    int_fast32_t sec;
+    int_fast32_t sec; //INT_FAST32_MIN <= sec <= INT_FAST32_MAX
 #else
-    int_fast64_t sec;
+    int_fast64_t sec; //INT_FAST64_MIN <= sec <= INT_FAST64_MAX
 #endif
-    int_fast32_t nsec;
+    int_fast32_t nsec; //0 <= xtime.nsec < NANOSECONDS_PER_SECOND
 };
 
 int BOOST_THREAD_DECL xtime_get(struct xtime* xtp, int clock_type);
+
 inline int xtime_cmp(const xtime& xt1, const xtime& xt2)
 {
-    int res = (int)(xt1.sec - xt2.sec);
-    if (res == 0)
-        res = (int)(xt1.nsec - xt2.nsec);
-    return res;
+    if (xt1.sec == xt2.sec)
+        return (int)(xt1.nsec - xt2.nsec);
+    else 
+        return (xt1.sec > xt2.sec) ? 1 : -1;
 }
 
 } // namespace boost
 
-// Change Log:
-//   8 Feb 01  WEKEMPF Initial version.
-
-#endif // BOOST_XTIME_WEK070601_HPP
-
+#endif //BOOST_XTIME_WEK070601_HPP