diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c
index b173c15..19fdecf 100644
--- a/drivers/ata/pata_ixp4xx_cf.c
+++ b/drivers/ata/pata_ixp4xx_cf.c
@@ -176,7 +176,7 @@
 	ap = host->ports[0];
 
 	ap->ops	= &ixp4xx_port_ops;
-	ap->pio_mask = 0x1f; /* PIO4 */
+	ap->pio_mask = ATA_PIO4;
 	ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
 
 	ixp4xx_setup_port(ap, data, cs0->start, cs1->start);