diff --git a/exfat/libexfat/lookup.c b/exfat/libexfat/lookup.c
index d5bb389..3caef74 100644
--- a/exfat/libexfat/lookup.c
+++ b/exfat/libexfat/lookup.c
@@ -46,7 +46,7 @@
 	it->current = NULL;
 }
 
-struct exfat_node* exfat_readdir(struct exfat* ef, struct exfat_iterator* it)
+struct exfat_node* exfat_readdir(struct exfat* ef __unused, struct exfat_iterator* it)
 {
 	if (it->current == NULL)
 		it->current = it->parent->child;