diff --git a/julearn/transformers/dataframe/filter_columns.py b/julearn/transformers/dataframe/filter_columns.py
index cf1e16cbe..84ca07899 100644
--- a/julearn/transformers/dataframe/filter_columns.py
+++ b/julearn/transformers/dataframe/filter_columns.py
@@ -55,8 +55,8 @@ def __init__(
 
     def _fit(
         self,
-        X: pd.DataFrame,
-        y: Optional[DataLike] = None,  # noqa: N803
+        X: pd.DataFrame,  # noqa: N803
+        y: Optional[DataLike] = None,
     ) -> "FilterColumns":
         """Fit the transformer.