diff --git a/py-polars/tests/unit/operations/rolling/test_rolling.py b/py-polars/tests/unit/operations/rolling/test_rolling.py
index 0fe64b793d85..29df58c5d570 100644
--- a/py-polars/tests/unit/operations/rolling/test_rolling.py
+++ b/py-polars/tests/unit/operations/rolling/test_rolling.py
@@ -6,11 +6,11 @@
 import numpy as np
 import pytest
 from numpy import nan
-
-import polars as pl
 from polars.exceptions import ComputeError, InvalidOperationError
 from polars.testing import assert_frame_equal, assert_series_equal
 
+import polars as pl
+
 if TYPE_CHECKING:
     from polars.type_aliases import ClosedInterval, PolarsDataType, TimeUnit
 
@@ -993,6 +993,6 @@ def test_rolling_duration(time_unit: Literal["ns", "us", "ms"]) -> None:
 
     assert (
         res_duration["value"].to_list() == res_datetime["value"].to_list()
-    ), f"{res_duration["value"].to_list()}, {res_datetime["value"].to_list()}"
+    ), f"{res_duration['value'].to_list()}, {res_datetime['value'].to_list()}"
 
     assert res_duration["index_column"].dtype == pl.Duration(time_unit=time_unit)