diff --git a/mm/page_io.c b/mm/page_io.c
index 6424869..520baa4b 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -69,7 +69,7 @@
 	bio_put(bio);
 }
 
-void end_swap_bio_read(struct bio *bio, int err)
+static void end_swap_bio_read(struct bio *bio, int err)
 {
 	const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
 	struct page *page = bio->bi_io_vec[0].bv_page;