diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index d5313bc5b..50c426364 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -1,3 +1,7 @@
+2009-07-18 Jeff Lu  <jll544@yahoo.com>
+
+	* mingwex/usleep.c: round up to next ms
+
 2009-07-17  Chris Sutcliffe  <ir0nh34d@users.sourceforge.net>
 
 	* mingwex/math/cephes_mconf.h mingwex/math/erfl.c mingwex/math/lgamma.c
diff --git a/winsup/mingw/mingwex/usleep.c b/winsup/mingw/mingwex/usleep.c
index b322a7703..c059c0691 100755
--- a/winsup/mingw/mingwex/usleep.c
+++ b/winsup/mingw/mingwex/usleep.c
@@ -34,7 +34,7 @@ int __cdecl usleep(useconds_t useconds)
     if(useconds >= 1000000)
         return EINVAL;
 
-    Sleep(useconds / 1000);
+    Sleep((useconds + 999) / 1000);
 
     return 0;
 }