diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index a92166b22..c0a458131 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2004-08-28  Pierre Humblet <pierre.humblet@ieee.org>
+
+	* syscalls.cc (ftruncate64): On 9x, call write with a zero length
+	to zero fill when the file is extended.
+
 2004-08-24  Corinna Vinschen  <corinna@vinschen.de>
 
 	* syscalls.cc (link): Avoid compiler warning.
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 1b3e3c512..d928bd6e4 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -1676,7 +1676,7 @@ setmode (int fd, int mode)
 extern "C" int
 ftruncate64 (int fd, _off64_t length)
 {
-  int res = -1;
+  int res = -1, res_bug = 0;
 
   if (length < 0)
     set_errno (EINVAL);
@@ -1693,10 +1693,13 @@ ftruncate64 (int fd, _off64_t length)
 	      _off64_t prev_loc = cfd->lseek (0, SEEK_CUR);
 
 	      cfd->lseek (length, SEEK_SET);
+	      /* Fill the space with 0, if needed */
+	      if (wincap.has_lseek_bug ())
+		res_bug = cfd->write (&res, 0);
 	      if (!SetEndOfFile (h))
 		__seterrno ();
 	      else
-		res = 0;
+		res = res_bug;
 
 	      /* restore original file pointer location */
 	      cfd->lseek (prev_loc, SEEK_SET);