diff --git a/tests/laborious/activities/test_mlflow.py b/tests/laborious/activities/test_mlflow.py
index 666ec7f..85cb7f1 100644
--- a/tests/laborious/activities/test_mlflow.py
+++ b/tests/laborious/activities/test_mlflow.py
@@ -154,9 +154,6 @@ async def test_request_predict(mock_max, mock_to_datetime, mock_dataframe, mlflo
     mock_dataframe.return_value.__setitem__.assert_any_call(
         'timestamp', mock_to_datetime.return_value.dt.strftime.return_value
     )
-    mock_dataframe.return_value.__setitem__.assert_any_call(
-        'timestamp', mock_to_datetime.return_value.dt.strftime.return_value
-    )
 
     mock_to_datetime.assert_called_once_with(
         mock_dataframe.return_value.__getitem__.return_value, format=DATETIME_FORMAT_WITH_TZ