diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 52b54f0..118c777 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -133,7 +133,7 @@
  *
  * Call hotplug for each new devices.
  */
-void pci_bus_add_devices(struct pci_bus *bus)
+void pci_bus_add_devices(const struct pci_bus *bus)
 {
 	struct pci_dev *dev;
 	struct pci_bus *child;