diff --git a/tomcat_bec/devices/unsupported_legacy/psi_detector_base.py b/tomcat_bec/devices/unsupported_legacy/psi_detector_base.py
index 1f76a4d..59146dc 100644
--- a/tomcat_bec/devices/unsupported_legacy/psi_detector_base.py
+++ b/tomcat_bec/devices/unsupported_legacy/psi_detector_base.py
@@ -26,7 +26,6 @@ from ophyd_devices.utils.errors import DeviceStopError, DeviceTimeoutError
 logger = bec_logger.logger
 
 
-
 class BECDeviceBaseError(Exception):
     """Error class for BECDeviceBase."""
 
@@ -43,7 +42,7 @@ class CustomDetectorMixin:
     will allow the custom prepare class to access the parent device with all its signals.
     """
 
-    def __init__(self, *_args, parent: T = None, **_kwargs) -> None:
+    def __init__(self, *_args, parent=None, **_kwargs) -> None:
         """
         Initialize the custom prepare class.
 
@@ -571,4 +570,4 @@ class PSIDetectorBase(Device):
             return status
         status = DeviceStatus(self)
         status.set_finished()
-        return status
\ No newline at end of file
+        return status