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diff --git a/gnu/mbrtowc.c b/gnu/mbrtowc.c
index 50e37b97..e49d55b3 100644
--- a/gnu/mbrtowc.c
+++ b/gnu/mbrtowc.c
@@ -1,7 +1,5 @@
-/* -*- buffer-read-only: t -*- vi: set ro: */
-/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
 /* Convert multibyte character to wide character.
-   Copyright (C) 1999-2002, 2005-2014 Free Software Foundation, Inc.
+   Copyright (C) 1999-2002, 2005-2015 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2008.
 
    This program is free software: you can redistribute it and/or modify
@@ -330,7 +328,7 @@ mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
 size_t
 rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
 {
-# if MBRTOWC_NULL_ARG2_BUG || MBRTOWC_RETVAL_BUG
+# if MBRTOWC_NULL_ARG2_BUG || MBRTOWC_RETVAL_BUG || MBRTOWC_EMPTY_INPUT_BUG
   if (s == NULL)
     {
       pwc = NULL;
@@ -339,6 +337,11 @@ rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
     }
 # endif
 
+# if MBRTOWC_EMPTY_INPUT_BUG
+  if (n == 0)
+    return (size_t) -2;
+# endif
+
 # if MBRTOWC_RETVAL_BUG
   {
     static mbstate_t internal_state;