diff --git a/src/northbridge/intel/x4x/northbridge.c b/src/northbridge/intel/x4x/northbridge.c
index cdf43c95..ac276b6 100644
--- a/src/northbridge/intel/x4x/northbridge.c
+++ b/src/northbridge/intel/x4x/northbridge.c
@@ -123,7 +123,7 @@
 	if (dev->path.type == DEVICE_PATH_DOMAIN)
 		return "PCI0";
 
-	if (dev->path.type != DEVICE_PATH_PCI || dev->bus->secondary != 0)
+	if (!is_pci_dev_on_bus(dev, 0))
 		return NULL;
 
 	switch (dev->path.pci.devfn) {