diff --git a/archival/libunarchive/header_skip.c b/archival/libunarchive/header_skip.c
index 4430178f8..0b153980e 100644
--- a/archival/libunarchive/header_skip.c
+++ b/archival/libunarchive/header_skip.c
@@ -1,7 +1,6 @@
 #include <stdio.h>
 #include "unarchive.h"
 
-extern void header_skip(const file_header_t *file_header)
+extern void header_skip(const file_header_t *file_header __attribute__((unused)))
 {
-	return;
 }