diff --git a/py-polars/tests/unit/io/test_parquet.py b/py-polars/tests/unit/io/test_parquet.py
index d6450aaefbaf..866f30ea7386 100644
--- a/py-polars/tests/unit/io/test_parquet.py
+++ b/py-polars/tests/unit/io/test_parquet.py
@@ -1230,7 +1230,7 @@ def test_read_byte_stream_split_arrays(
 def test_parquet_nested_null_array_17795(tmp_path: Path) -> None:
     filename = tmp_path / "nested_null.parquet"
 
-    pl.DataFrame([ {"struct": {"field": None}} ]).write_parquet(filename)
+    pl.DataFrame([{"struct": {"field": None}}]).write_parquet(filename)
     pq.read_table(filename)