diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 8c7a629..771de7a 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -161,6 +161,7 @@
 	/* internals */
 	struct list_head		list;
 	DECLARE_BITMAP(endpoints, 32);
+	const struct usb_function_instance *fi;
 };
 
 int usb_add_function(struct usb_configuration *, struct usb_function *);