diff --git a/narwhals/_arrow/group_by.py b/narwhals/_arrow/group_by.py
index 4e78953cf..030fcd113 100644
--- a/narwhals/_arrow/group_by.py
+++ b/narwhals/_arrow/group_by.py
@@ -100,7 +100,7 @@ def __iter__(self) -> Iterator[tuple[Any, ArrowDataFrame]]:
                 next(
                     (
                         t := self._df._from_native_frame(
-                            table.filter(pc.equal(table[col_token], v)).drop(col_token)
+                            table.filter(pc.equal(table[col_token], v)).drop([col_token])
                         )
                     )
                     .select(*self._keys)