diff --git a/src/southbridge/intel/bd82x6x/usb_ehci.c b/src/southbridge/intel/bd82x6x/usb_ehci.c
index 9850fee..b76963f 100644
--- a/src/southbridge/intel/bd82x6x/usb_ehci.c
+++ b/src/southbridge/intel/bd82x6x/usb_ehci.c
@@ -66,8 +66,9 @@
 	res = find_resource(dev, PCI_BASE_ADDRESS_0);
 	if (res) {
 		/* Number of ports and companion controllers.  */
-		reg32 = read32(res->base + 4);
-		write32(res->base + 4, (reg32 & 0xfff00000) | 3);
+		reg32 = read32((void *)(uintptr_t)(res->base + 4));
+		write32((void *)(uintptr_t)(res->base + 4),
+			(reg32 & 0xfff00000) | 3);
 	}
 
 	/* Restore protection. */