diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 3147c8d..5c934b6 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1788,7 +1788,7 @@
 		goto bad;
 	}
 
-	cc->per_bio_data_size = ti->per_bio_data_size =
+	cc->per_bio_data_size = ti->per_io_data_size =
 		ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start +
 		      sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size,
 		      ARCH_KMALLOC_MINALIGN);