diff --git a/tests/utils/repository/test_data_manager_repository.py b/tests/utils/repository/test_data_manager_repository.py
index 57d0ffa..6689949 100644
--- a/tests/utils/repository/test_data_manager_repository.py
+++ b/tests/utils/repository/test_data_manager_repository.py
@@ -134,8 +134,9 @@ def test_set_timezone_on_index_converts_aware_index_to_utc():
 
 def test_set_timezone_on_index_non_datetime_index_raises():
     repo = dmr.DataManagerRepository(MagicMock())
+    df = pd.DataFrame({'v1': [1]})
     with pytest.raises(ValueError, match='Index is not a DatetimeIndex'):
-        repo._set_timezone_on_index(pd.DataFrame({'v1': [1]}))
+        repo._set_timezone_on_index(df)
 
 
 def test_prepare_training_data_csv_load_failure():