diff --git a/tests/tests/tier0/bluechi-invalid-port/test_agent_invalid_port.py b/tests/tests/tier0/bluechi-invalid-port/test_agent_invalid_port.py
index 4a2c3c79eb..88ee12d535 100644
--- a/tests/tests/tier0/bluechi-invalid-port/test_agent_invalid_port.py
+++ b/tests/tests/tier0/bluechi-invalid-port/test_agent_invalid_port.py
@@ -15,6 +15,7 @@ def exec(ctrl: BluechiControllerMachine, _: Dict[str, BluechiAgentMachine]):
     assert ctrl.wait_for_unit_state_to_be("bluechi-controller", "active")
 
     original_cfg = ctrl.config.deep_copy()
+    original_cfg.file_name = "zzz-ctrl.conf"
 
     # port contains an 'O' instead of a '0'
     new_cfg = original_cfg.deep_copy()