diff --git a/headers/private/graphics/matrox/DriverInterface.h b/headers/private/graphics/matrox/DriverInterface.h
index 7f729813c1..fb8056bb8b 100644
--- a/headers/private/graphics/matrox/DriverInterface.h
+++ b/headers/private/graphics/matrox/DriverInterface.h
@@ -18,6 +18,7 @@
 #include <OS.h>
 
 #define DRIVER_PREFIX "mga" // apsed
+#define DEVICE_FORMAT "%04X_%04X_%02X%02X%02X" // apsed
 
 /*
 	Internal driver state (also for sharing info between driver and accelerant)
@@ -98,6 +99,9 @@ typedef struct {
 	uint16	vendor_id;	/* PCI vendor ID, from pci_info */
 	uint16	device_id;	/* PCI device ID, from pci_info */
 	uint8	revision;	/* PCI device revsion, from pci_info */
+	uint8	bus;		/* PCI bus number, from pci_info */
+	uint8	device;		/* PCI device number on bus, from pci_info */
+	uint8	function;	/* PCI function number in device, from pci_info */
 
   /* bug workaround for 4.5.0 */
 	uint32 use_clone_bugfix;	/*for 4.5.0, cloning of physical memory does not work*/