diff --git a/lib/libarchive/archive_read_support_format_empty.c b/lib/libarchive/archive_read_support_format_empty.c
index 38498cf7ff3d..05c495829305 100644
--- a/lib/libarchive/archive_read_support_format_empty.c
+++ b/lib/libarchive/archive_read_support_format_empty.c
@@ -59,10 +59,9 @@ archive_read_support_format_empty(struct archive *_a)
 static int
 archive_read_format_empty_bid(struct archive_read *a)
 {
-	const void *h;
 	ssize_t avail;
 
-	h = __archive_read_ahead(a, 1, &avail);
+	(void)__archive_read_ahead(a, 1, &avail);
 	if (avail != 0)
 		return (-1);
 	return (1);