diff --git a/tests/test_file_writer_service.py b/tests/test_file_writer_service.py
index 4c64ca6..1b1ab33 100644
--- a/tests/test_file_writer_service.py
+++ b/tests/test_file_writer_service.py
@@ -4,7 +4,6 @@ import numpy as np
 import pytest
 from bec_lib.core import BECMessage, MessageEndpoints, ServiceConfig
 from bec_lib.core.redis_connector import MessageObject
-from bec_lib.core.tests.utils import ConnectorMock
 
 from bec_plugins.services.NIDAQ_writer import NIDAQWriterService