diff --git a/sys/dev/ata/ata-all.c b/sys/dev/ata/ata-all.c
index 2958b2cad999..c3c252d57d08 100644
--- a/sys/dev/ata/ata-all.c
+++ b/sys/dev/ata/ata-all.c
@@ -1033,7 +1033,7 @@ ata_command(struct ata_device *atadev, u_int8_t command,
 	ATA_OUTB(atadev->channel->r_io, ATA_COUNT, count & 0xff);
 	ATA_OUTB(atadev->channel->r_io, ATA_SECTOR, (lba>>24) & 0xff);
 	ATA_OUTB(atadev->channel->r_io, ATA_SECTOR, lba & 0xff);
-	ATA_OUTB(atadev->channel->r_io, ATA_CYL_LSB, (lba<<32) & 0xff);
+	ATA_OUTB(atadev->channel->r_io, ATA_CYL_LSB, (lba>>32) & 0xff);
 	ATA_OUTB(atadev->channel->r_io, ATA_CYL_LSB, (lba>>8) & 0xff);
 	ATA_OUTB(atadev->channel->r_io, ATA_CYL_MSB, (lba>>40) & 0xff);
 	ATA_OUTB(atadev->channel->r_io, ATA_CYL_MSB, (lba>>16) & 0xff);