diff --git a/src/opticalattackdetector/tests/test_unitary.py b/src/opticalattackdetector/tests/test_unitary.py
index 97e5a68d2f87d52a8d3397338c6c16cb9fbd4b57..9a4e23c8fc28a25f3747d5dc8d485c3eca4ec17e 100644
--- a/src/opticalattackdetector/tests/test_unitary.py
+++ b/src/opticalattackdetector/tests/test_unitary.py
@@ -73,6 +73,6 @@ def test_detect_attack(
             request.service_id.service_uuid.uuid = str(uuid.uuid4())
             request.kpi_id.kpi_id.uuid = "1"
             optical_attack_detector_client.DetectAttack(request)
-            dbscanserving.assert_called_once()
+            dbscanserving.assert_called()
             monitoring.assert_called_once()
         mitigator.NotifyAttack.assert_called()