diff --git a/v4l2py/device.py b/v4l2py/device.py
index c0e5eab..524d240 100644
--- a/v4l2py/device.py
+++ b/v4l2py/device.py
@@ -4,6 +4,7 @@
 # Copyright (c) 2021 Tiago Coutinho
 # Distributed under the GPLv3 license. See LICENSE for more info.
 
-# ruff: noqa: F403
+# ruff: noqa: F401, F403
 
+from linuxpy.device import device_number
 from linuxpy.video.device import *