1 diff --git i/lib/regex_internal.h w/lib/regex_internal.h
2 index 859832f..3c7fe06 100644
3 --- i/lib/regex_internal.h
4 +++ w/lib/regex_internal.h
5 @@ -826,7 +826,8 @@ re_string_wchar_at (const re_string_t *pstr, Idx idx)
8 internal_function __attribute ((pure))
9 -re_string_elem_size_at (const re_string_t *pstr, Idx idx)
10 +re_string_elem_size_at (const re_string_t *pstr _UNUSED_PARAMETER_,
11 + Idx idx _UNUSED_PARAMETER_)
14 const unsigned char *p, *extra;