diff --git a/os/pl-stream.c b/os/pl-stream.c
index 578a2e024..4bc122cdf 100755
--- a/os/pl-stream.c
+++ b/os/pl-stream.c
@@ -33,7 +33,6 @@
 #endif
 #endif
 #include <winsock2.h>
-#include "windows/mswchar.h"
 #define CRLF_MAPPING 1
 #else
 #include <config.h>
@@ -3527,7 +3526,7 @@ SinitStreams(void)
 
 
 IOSTREAM *
-S__getiob()
+S__getiob(void)
 { return S__iob;
 }
 
diff --git a/os/windows/mswchar.h b/os/windows/mswchar.h
deleted file mode 100644
index f43d230a3..000000000
--- a/os/windows/mswchar.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*  $Id$
-
-    Part of SWI-Prolog
-
-    Author:        Jan Wielemaker
-    E-mail:        wielemak@science.uva.nl
-    WWW:           http://www.swi-prolog.org
-    Copyright (C): 1985-2005, University of Amsterdam
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Lesser General Public
-    License as published by the Free Software Foundation; either
-    version 2.1 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Lesser General Public License for more details.
-
-    You should have received a copy of the GNU Lesser General Public
-    License along with this library; if not, write to the Free Software
-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-*/
-
-#include <wchar.h>
-
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-See pl-mswchar.cpp for  the  motivation  for   this  nonsense.  Used  in
-pl-fli.c and pl-text.c.
-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
-
-#ifdef __WINDOWS__
-#define wcrtomb(s, wc, ps)	ms_wcrtomb(s, wc, ps)
-#define mbrtowc(pwc, s, n, ps)	ms_mbrtowc(pwc, s, n, ps)
-
-extern size_t ms_wcrtomb(char *s, wchar_t wc, mbstate_t *ps);
-extern size_t ms_mbrtowc(wchar_t *pwc, const char *s, size_t n, mbstate_t *ps);
-#endif