diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index 6446735a46e0..a8c0cbeca399 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -931,13 +931,13 @@ static int hpt37x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 		.udma_mask = 0x7f,
 		.port_ops = &hpt372_port_ops
 	};
-	/* HPT374 - UDMA133 */
+	/* HPT374 - UDMA100 */
 	static const struct ata_port_info info_hpt374 = {
 		.sht = &hpt37x_sht,
 		.flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST,
 		.pio_mask = 0x1f,
 		.mwdma_mask = 0x07,
-		.udma_mask = 0x7f,
+		.udma_mask = 0x3f,
 		.port_ops = &hpt374_port_ops
 	};