diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index d636ede064aa..8bcdfa64667c 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -360,7 +360,7 @@ static void pdc_sata_phy_reset(struct ata_port *ap)
 static void pdc_pata_cbl_detect(struct ata_port *ap)
 {
 	u8 tmp;
-	void __iomem *mmio = (void *) ap->ioaddr.cmd_addr + PDC_CTLSTAT + 0x03;
+	void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr + PDC_CTLSTAT + 0x03;
 
 	tmp = readb(mmio);