diff --git a/ChangeLog b/ChangeLog
index 33f6263a21..dc11d96b53 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,7 @@
 Wed Nov  9 23:20:22 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (rb_update_max_fd): fstat(2) can fail with other than
-	  EBADF.  [ruby-dev:44837] [Backport #4339].  Cf.
+	  EBADF.  [ruby-dev:44837] [Bug #5593].  Cf.
 	  http://pubs.opengroup.org/onlinepubs/9699919799/functions/fstat.html
 
 	* io.c (rb_sysopen): max fd is updated in rb_sysopen_internal()