diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index 5ca5c556d..92b3dc6ee 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -1,3 +1,8 @@
+2004-12-20  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	* include/wchar.h (wcsdup): Correct prototype.
+	* include/string.h (wcsdup): Correct prototype.
+
 2004-10-14  Danny Smith  <dannysmith@users.sourceforge.net>
 
 	* include/sys/stat.h: Make S_ISLNK comment comply with ISO C90.
diff --git a/winsup/mingw/include/string.h b/winsup/mingw/include/string.h
index 44fff31ce..1047e5019 100644
--- a/winsup/mingw/include/string.h
+++ b/winsup/mingw/include/string.h
@@ -164,10 +164,11 @@ _CRTIMP  wchar_t* __cdecl __wcserror(const wchar_t*);
 
 #ifndef	_NO_OLDNAMES
 /* NOTE: There is no _wcscmpi, but this is for compatibility. */
+int __cdecl wcscmpi (const wchar_t * __ws1, const wchar_t * __ws2);
 __CRT_INLINE int __cdecl
 wcscmpi (const wchar_t * __ws1, const wchar_t * __ws2)
   {return _wcsicmp (__ws1, __ws2);}
-_CRTIMP wchar_t* __cdecl wcsdup (wchar_t*);
+_CRTIMP wchar_t* __cdecl wcsdup (const wchar_t*);
 _CRTIMP int __cdecl	wcsicmp (const wchar_t*, const wchar_t*);
 _CRTIMP int __cdecl	wcsicoll (const wchar_t*, const wchar_t*);
 _CRTIMP wchar_t* __cdecl wcslwr (wchar_t*);
diff --git a/winsup/mingw/include/wchar.h b/winsup/mingw/include/wchar.h
index 0314254b9..fd6af1299 100644
--- a/winsup/mingw/include/wchar.h
+++ b/winsup/mingw/include/wchar.h
@@ -238,7 +238,7 @@ _CRTIMP  wchar_t* __cdecl __wcserror(const wchar_t*);
 __CRT_INLINE int __cdecl
 wcscmpi (const wchar_t * __ws1, const wchar_t * __ws2)
   {return _wcsicmp (__ws1, __ws2);}
-_CRTIMP wchar_t* __cdecl wcsdup (wchar_t*);
+_CRTIMP wchar_t* __cdecl wcsdup (const wchar_t*);
 _CRTIMP int __cdecl	wcsicmp (const wchar_t*, const wchar_t*);
 _CRTIMP int __cdecl	wcsicoll (const wchar_t*, const wchar_t*);
 _CRTIMP wchar_t* __cdecl wcslwr (wchar_t*);