diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index 4ad7d5190..4ddc8e0a7 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -15,6 +15,7 @@
 	* include/stdio.h (_getws, _putws): Guard with #ifndef __STRICT_ANSI__.
 	(_wfdopen, _wfopen, _wfreopen, _wfsopen, _wtmpnam, _wtempnam): Ditto.
 	(_wrename, _wremove, _wperror, _wpopen): Ditto.
+	(_lock_file, _unlock_file): Declare.
 
 2012-08-01  Earnie Boyd  <earnie@users.sourceforge.net>
 
diff --git a/winsup/mingw/include/stdio.h b/winsup/mingw/include/stdio.h
index 27dae0bc6..60f540114 100644
--- a/winsup/mingw/include/stdio.h
+++ b/winsup/mingw/include/stdio.h
@@ -594,6 +594,8 @@ _CRTIMP wint_t __cdecl __MINGW_NOTHROW	getwchar (void);
 _CRTIMP wint_t __cdecl __MINGW_NOTHROW	putwc (wint_t, FILE*);
 _CRTIMP wint_t __cdecl __MINGW_NOTHROW	putwchar (wint_t);
 #ifndef __STRICT_ANSI__
+_CRTIMP void __cdecl __MINGW_NOTHROW _lock_file(FILE*);
+_CRTIMP void __cdecl __MINGW_NOTHROW _unlock_file(FILE*);
 _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, const wchar_t *);
@@ -606,7 +608,7 @@ _CRTIMP int __cdecl __MINGW_NOTHROW	_wrename (const wchar_t*, const wchar_t*);
 _CRTIMP int __cdecl __MINGW_NOTHROW	_wremove (const wchar_t*);
 _CRTIMP void __cdecl __MINGW_NOTHROW	_wperror (const wchar_t*);
 _CRTIMP FILE* __cdecl __MINGW_NOTHROW	_wpopen (const wchar_t*, const wchar_t*);
-#endif  /* __STRING_ANSI__ */
+#endif  /* __STRICT_ANSI__ */
 #endif	/* __MSVCRT__ */
 
 #ifndef __NO_ISOCEXT  /* externs in libmingwex.a */