diff --git a/src/add-ons/kernel/bus_managers/pci/pci_private.h b/src/add-ons/kernel/bus_managers/pci/pci_private.h
index a58220e7f4..8804848623 100644
--- a/src/add-ons/kernel/bus_managers/pci/pci_private.h
+++ b/src/add-ons/kernel/bus_managers/pci/pci_private.h
@@ -47,9 +47,9 @@ extern "C" {
 void *		pci_ram_address(const void *physical_address_in_system_memory);
 
 status_t 	pci_find_capability(uint8 bus, uint8 device, uint8 function,
-	uint8 cap_id, uint8 *offset = NULL);
+	uint8 cap_id, uint8 *offset);
 status_t 	pci_find_extended_capability(uint8 bus, uint8 device, uint8 function, 
-	uint16 cap_id, uint16 *offset = NULL);
+	uint16 cap_id, uint16 *offset);
 
 status_t	pci_reserve_device(uchar virtualBus, uchar device, uchar function,
 			const char *driverName, void *nodeCookie);