diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index 0cc75f7df..012666a16 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -1,3 +1,10 @@
+2008-06-14  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	[mingw-Bugs-1801641]
+	* include/wchar.h (_wfdopen): Const-ify second arg.
+	* include/stdio.h (_wfdopen): Likewise.
+	Thanks to <tdragon at users dot sourceforge net>
+
 2008-06-02  Keith Marshall  <keithmarshall@users.sourceforge.net>
 
 	Avoid precision errors in round(), lround() and llround() functions.
diff --git a/winsup/mingw/include/stdio.h b/winsup/mingw/include/stdio.h
index 90a6ff584..45b369ea5 100644
--- a/winsup/mingw/include/stdio.h
+++ b/winsup/mingw/include/stdio.h
@@ -464,7 +464,7 @@ _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _getws (wchar_t*);
 _CRTIMP wint_t __cdecl __MINGW_NOTHROW	putwc (wint_t, FILE*);
 _CRTIMP int __cdecl __MINGW_NOTHROW	_putws (const wchar_t*);
 _CRTIMP wint_t __cdecl __MINGW_NOTHROW	putwchar (wint_t);
-_CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfdopen(int, wchar_t *);
+_CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfdopen(int, const wchar_t *);
 _CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfopen (const wchar_t*, const wchar_t*);
 _CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfreopen (const wchar_t*, const wchar_t*, FILE*);
 _CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfsopen (const wchar_t*, const wchar_t*, int);
diff --git a/winsup/mingw/include/wchar.h b/winsup/mingw/include/wchar.h
index 9109c5e27..d72527a1f 100644
--- a/winsup/mingw/include/wchar.h
+++ b/winsup/mingw/include/wchar.h
@@ -125,7 +125,7 @@ _CRTIMP wint_t __cdecl __MINGW_NOTHROW	putwchar (wint_t);
 #ifndef __STRICT_ANSI__
 _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _getws (wchar_t*);
 _CRTIMP int __cdecl __MINGW_NOTHROW	_putws (const wchar_t*);
-_CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfdopen(int, wchar_t *);
+_CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfdopen(int, const wchar_t *);
 _CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfopen (const wchar_t*, const wchar_t*);
 _CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfreopen (const wchar_t*, const wchar_t*, FILE*);
 _CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wfsopen (const wchar_t*, const wchar_t*, int);