diff --git a/src/openflexure_microscope_server/things/background_detect.py b/src/openflexure_microscope_server/things/background_detect.py
index 457bc612..744ed402 100644
--- a/src/openflexure_microscope_server/things/background_detect.py
+++ b/src/openflexure_microscope_server/things/background_detect.py
@@ -1,5 +1,3 @@
-# ruff: noqa: E722
-
 from typing import Mapping, Optional
 import cv2
 import numpy as np