diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 4113bc6b6..8f96fbaaa 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2003-12-03  Pierre Humblet <pierre.humblet@ieee.org>
+
+	* fhandler_disk_file.cc (fhandler_disk_file::lock): Interchange
+	values of off_low and off_high.
+
 2003-12-03  Corinna Vinschen  <corinna@vinschen.de>
 
 	* fcntl.cc (fcntl_worker): Remove static storage class.
diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc
index c51eace2a..2c8829ca4 100644
--- a/winsup/cygwin/fhandler_disk_file.cc
+++ b/winsup/cygwin/fhandler_disk_file.cc
@@ -536,8 +536,8 @@ fhandler_disk_file::lock (int cmd, struct __flock64 *fl)
 
   DWORD off_high, off_low, len_high, len_low;
 
-  off_high = (DWORD)(win32_start & 0xffffffff);
-  off_low = (DWORD)(win32_start >> 32);
+  off_low = (DWORD)(win32_start & 0xffffffff);
+  off_high = (DWORD)(win32_start >> 32);
   if (win32_len == 0)
     {
       /* Special case if len == 0 for POSIX means lock to the end of