diff --git a/include/linux/usbdevice_fs.h b/include/linux/usbdevice_fs.h
index 8ca5a7f..17cb108 100644
--- a/include/linux/usbdevice_fs.h
+++ b/include/linux/usbdevice_fs.h
@@ -104,7 +104,7 @@
 	int error_count;
 	unsigned int signr;	/* signal to be sent on completion,
 				  or 0 if none should be sent. */
-	void *usercontext;
+	void __user *usercontext;
 	struct usbdevfs_iso_packet_desc iso_frame_desc[0];
 };