diff --git a/tests/unit_tests/test_server_cli.py b/tests/unit_tests/test_server_cli.py
index 0f0bdec2..0e7b3ef7 100644
--- a/tests/unit_tests/test_server_cli.py
+++ b/tests/unit_tests/test_server_cli.py
@@ -117,8 +117,7 @@ def test_debug_mode(mocker):
         "openflexure_microscope_server.server.lt.ThingServer.from_config",
         return_value=mocker.Mock(),
     )
-    # Mock customisation to avoid side effects
-    mocker.patch.object(ofm_server, "customise_server")
+
     # Mock uvicorn.run to avoid starting a server
     mocker.patch("openflexure_microscope_server.server.uvicorn.run")