diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c
index 12a7182b4ad39bca6ac89c2b61f5e3c0b0a669b7..253a20fc8061f3c2dae16bebe849ddb743f111c5 100644
--- a/drivers/ide/legacy/dtc2278.c
+++ b/drivers/ide/legacy/dtc2278.c
@@ -130,6 +130,7 @@ static int __init dtc2278_probe(void)
 
 	mate->serialized = 1;
 	mate->chipset = ide_dtc2278;
+	mate->pio_mask = ATA_PIO4;
 	mate->drives[0].no_unmask = 1;
 	mate->drives[1].no_unmask = 1;
 	mate->mate = hwif;