diff --git a/drivers/ata/pata_serverworks.c b/drivers/ata/pata_serverworks.c
index beaed12d50e469d4a7d79c43fd459d1346b131d2..9acabd2e336ac2221b2fc7aa5e852ef9bd2c3413 100644
--- a/drivers/ata/pata_serverworks.c
+++ b/drivers/ata/pata_serverworks.c
@@ -1,6 +1,7 @@
 /*
  * pata_serverworks.c 	- Serverworks PATA for new ATA layer
  *			  (C) 2005 Red Hat Inc
+ *			  (C) 2010 Bartlomiej Zolnierkiewicz
  *
  * based upon
  *
@@ -253,7 +254,7 @@ static void serverworks_set_piomode(struct ata_port *ap, struct ata_device *adev
 	if (serverworks_is_csb(pdev)) {
 		pci_read_config_word(pdev, 0x4A, &csb5_pio);
 		csb5_pio &= ~(0x0F << devbits);
-		pci_write_config_byte(pdev, 0x4A, csb5_pio | (pio << devbits));
+		pci_write_config_word(pdev, 0x4A, csb5_pio | (pio << devbits));
 	}
 }