diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index bfec66fb26e2..f1125fd7243d 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -4039,11 +4039,6 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
 	args.done = cmd->scsi_done;
 
 	switch(scsicmd[0]) {
-	/* TODO: worth improving? */
-	case FORMAT_UNIT:
-		ata_scsi_invalid_field(dev, cmd, 0);
-		break;
-
 	case INQUIRY:
 		if (scsicmd[1] & 2)		   /* is CmdDt set?  */
 		    ata_scsi_invalid_field(dev, cmd, 1);