diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index cf70702..667acd2 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1250,6 +1250,7 @@
 
 		ata_sg_init(qc, sg, n_elem);
 		qc->nsect = buflen / ATA_SECT_SIZE;
+		qc->nbytes = buflen;
 	}
 
 	qc->private_data = &wait;