Index: uspace/lib/usbdev/include/usb/dev/driver.h
===================================================================
--- uspace/lib/usbdev/include/usb/dev/driver.h	(revision 876190455543e9023b6f1b801b4152ef1cce31fd)
+++ uspace/lib/usbdev/include/usb/dev/driver.h	(revision 50f19b7ee8e94570b5c63896736c4eb49cfa18db)
@@ -43,9 +43,9 @@
 typedef struct {
 	/** Callback when a new device was added to the system. */
-	int (*device_add)(usb_device_t *);
+	errno_t (*device_add)(usb_device_t *);
 	/** Callback when a device is about to be removed from the system. */
-	int (*device_rem)(usb_device_t *);
+	errno_t (*device_rem)(usb_device_t *);
 	/** Callback when a device was removed from the system. */
-	int (*device_gone)(usb_device_t *);
+	errno_t (*device_gone)(usb_device_t *);
 } usb_driver_ops_t;