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diff --git a/lib/regex_internal.h b/lib/regex_internal.h
index 439444c..7242084 100644
--- a/lib/regex_internal.h
+++ b/lib/regex_internal.h
@@ -827,7 +827,8 @@ re_string_wchar_at (const re_string_t *pstr, Idx idx)
# ifndef NOT_IN_libc
static int
internal_function __attribute__ ((pure, unused))
-re_string_elem_size_at (const re_string_t *pstr, Idx idx)
+re_string_elem_size_at (const re_string_t *pstr _UNUSED_PARAMETER_,
+ Idx idx _UNUSED_PARAMETER_)
{
# ifdef _LIBC
const unsigned char *p, *extra;
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