diff --git a/libio/ChangeLog b/libio/ChangeLog
index e835328d8e7..bb3722cc4e5 100644
--- a/libio/ChangeLog
+++ b/libio/ChangeLog
@@ -1,7 +1,3 @@
-Sat Jan 30 08:07:56 1999  Mumit Khan  <khan@xraylith.wisc.edu>
-
-	* stdiostream.cc (_POSIX_SOURCE): Define. 
-
 1998-11-26  Manfred Hollstein  <manfred@s-direktnet.de>
 
 	* configure.in (compiler_name): Add check to detect if this
diff --git a/libio/stdiostream.cc b/libio/stdiostream.cc
index 7fb671402e8..bc9bef08ab6 100644
--- a/libio/stdiostream.cc
+++ b/libio/stdiostream.cc
@@ -1,5 +1,5 @@
 /* This is part of libio/iostream, providing -*- C++ -*- input/output.
-Copyright (C) 1993, 1999 Free Software Foundation
+Copyright (C) 1993 Free Software Foundation
 
 This file is part of the GNU IO Library.  This library is free
 software; you can redistribute it and/or modify it under the
@@ -28,9 +28,6 @@ the executable file might be covered by the GNU General Public License. */
 #pragma implementation
 #endif
 
-#ifndef _POSIX_SOURCE
-# define _POSIX_SOURCE
-#endif
 #include <stdiostream.h>
 #include "libioP.h"