diff --git a/py-polars/polars/lazyframe/frame.py b/py-polars/polars/lazyframe/frame.py
index 5ff9304d584e..51aafc3c4b15 100644
--- a/py-polars/polars/lazyframe/frame.py
+++ b/py-polars/polars/lazyframe/frame.py
@@ -5705,8 +5705,8 @@ def drop_nulls(
 
     def unpivot(
         self,
-        *,
         on: ColumnNameOrSelector | Sequence[ColumnNameOrSelector] | None = None,
+        *,
         index: ColumnNameOrSelector | Sequence[ColumnNameOrSelector] | None = None,
         variable_name: str | None = None,
         value_name: str | None = None,