diff --git a/drivers/ide/pci/cmd64x.c b/drivers/ide/pci/cmd64x.c
index 3de9ab897e42..3d9c7afc8695 100644
--- a/drivers/ide/pci/cmd64x.c
+++ b/drivers/ide/pci/cmd64x.c
@@ -608,7 +608,7 @@ static unsigned int __devinit init_chipset_cmd64x(struct pci_dev *dev, const cha
 
 #ifdef __i386__
 	if (dev->resource[PCI_ROM_RESOURCE].start) {
-		pci_write_config_byte(dev, PCI_ROM_ADDRESS, dev->resource[PCI_ROM_RESOURCE].start | PCI_ROM_ADDRESS_ENABLE);
+		pci_write_config_dword(dev, PCI_ROM_ADDRESS, dev->resource[PCI_ROM_RESOURCE].start | PCI_ROM_ADDRESS_ENABLE);
 		printk(KERN_INFO "%s: ROM enabled at 0x%08lx\n", name, dev->resource[PCI_ROM_RESOURCE].start);
 	}
 #endif
diff --git a/drivers/ide/pci/hpt34x.c b/drivers/ide/pci/hpt34x.c
index bbde46279984..be334da7a754 100644
--- a/drivers/ide/pci/hpt34x.c
+++ b/drivers/ide/pci/hpt34x.c
@@ -173,7 +173,7 @@ static unsigned int __devinit init_chipset_hpt34x(struct pci_dev *dev, const cha
 
 	if (cmd & PCI_COMMAND_MEMORY) {
 		if (pci_resource_start(dev, PCI_ROM_RESOURCE)) {
-			pci_write_config_byte(dev, PCI_ROM_ADDRESS,
+			pci_write_config_dword(dev, PCI_ROM_ADDRESS,
 				dev->resource[PCI_ROM_RESOURCE].start | PCI_ROM_ADDRESS_ENABLE);
 			printk(KERN_INFO "HPT345: ROM enabled at 0x%08lx\n",
 				dev->resource[PCI_ROM_RESOURCE].start);