diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
index 8133017..1b5d81f 100644
--- a/drivers/ata/sata_vsc.c
+++ b/drivers/ata/sata_vsc.c
@@ -371,7 +371,7 @@
 				  ATA_FLAG_MMIO,
 		.pio_mask	= 0x1f,
 		.mwdma_mask	= 0x07,
-		.udma_mask	= 0x7f,
+		.udma_mask	= ATA_UDMA6,
 		.port_ops	= &vsc_sata_ops,
 	};
 	const struct ata_port_info *ppi[] = { &pi, NULL };