diff --git a/csaxs_bec/device_configs/optics_hutch.yaml b/csaxs_bec/device_configs/optics_hutch.yaml
index d3957e5..3e92273 100644
--- a/csaxs_bec/device_configs/optics_hutch.yaml
+++ b/csaxs_bec/device_configs/optics_hutch.yaml
@@ -100,7 +100,7 @@ xbpm1y:
   readOnly: false
   readoutPriority: baseline
 
-Cu_foilx:
+cu_foilx:
   description: Cu foil in OPbox
   deviceClass: csaxs_bec.devices.smaract.smaract_ophyd.SmaractMotor
   deviceConfig: