diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 15a4c8a..989b775 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2342,7 +2342,7 @@
 	ata_qc_reinit(qc);
 
 	/* setup sg table and init transfer direction */
-	sg_init_one(&qc->sgent, cmd->sense_buffer, sizeof(cmd->sense_buffer));
+	sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
 	ata_sg_init(qc, &qc->sgent, 1);
 	qc->dma_dir = DMA_FROM_DEVICE;