diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 004b463..e164f58 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -232,7 +232,7 @@
 			SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 				    __FUNCTION__,
 				    dev->sata_dev.command_set);
-			ap->device[0].class = ATA_DEV_ATA;
+			ap->device[0].class = ATA_DEV_UNKNOWN;
 			break;
 	}