diff --git a/crates/polars-lazy/src/physical_plan/planner/expr.rs b/crates/polars-lazy/src/physical_plan/planner/expr.rs
index 2411539969d0..04cc5feb20bf 100644
--- a/crates/polars-lazy/src/physical_plan/planner/expr.rs
+++ b/crates/polars-lazy/src/physical_plan/planner/expr.rs
@@ -95,7 +95,6 @@ pub(crate) fn create_physical_expr(
         Window {
             mut function,
             partition_by,
-            order_by: _,
             options,
         } => {
             state.set_window();
diff --git a/crates/polars-plan/src/dsl/expr.rs b/crates/polars-plan/src/dsl/expr.rs
index 18eecfe055e5..5a640b6458d4 100644
--- a/crates/polars-plan/src/dsl/expr.rs
+++ b/crates/polars-plan/src/dsl/expr.rs
@@ -120,7 +120,6 @@ pub enum Expr {
         /// Also has the input. i.e. avg("foo")
         function: Box<Expr>,
         partition_by: Vec<Expr>,
-        order_by: Option<Box<Expr>>,
         options: WindowOptions,
     },
     Wildcard,
diff --git a/crates/polars-plan/src/dsl/mod.rs b/crates/polars-plan/src/dsl/mod.rs
index 87e6f8c3f624..18667e1d1fe6 100644
--- a/crates/polars-plan/src/dsl/mod.rs
+++ b/crates/polars-plan/src/dsl/mod.rs
@@ -946,7 +946,6 @@ impl Expr {
         Expr::Window {
             function: Box::new(self),
             partition_by,
-            order_by: None,
             options,
         }
     }
diff --git a/crates/polars-plan/src/logical_plan/aexpr/mod.rs b/crates/polars-plan/src/logical_plan/aexpr/mod.rs
index 67553c2e0084..cf450130eec1 100644
--- a/crates/polars-plan/src/logical_plan/aexpr/mod.rs
+++ b/crates/polars-plan/src/logical_plan/aexpr/mod.rs
@@ -178,7 +178,6 @@ pub enum AExpr {
     Window {
         function: Node,
         partition_by: Vec<Node>,
-        order_by: Option<Node>,
         options: WindowOptions,
     },
     #[default]
@@ -314,15 +313,11 @@ impl AExpr {
             Window {
                 function,
                 partition_by,
-                order_by,
                 options: _,
             } => {
                 for e in partition_by.iter().rev() {
                     container.push(*e);
                 }
-                if let Some(e) = order_by {
-                    container.push(*e);
-                }
                 // latest so that it is popped first
                 container.push(*function);
             },
@@ -398,14 +393,12 @@ impl AExpr {
             Window {
                 function,
                 partition_by,
-                order_by,
                 ..
             } => {
                 *function = *inputs.last().unwrap();
                 partition_by.clear();
                 partition_by.extend_from_slice(&inputs[..inputs.len() - 1]);
 
-                assert!(order_by.is_none());
                 return self;
             },
         };
diff --git a/crates/polars-plan/src/logical_plan/conversion.rs b/crates/polars-plan/src/logical_plan/conversion.rs
index 71d40564ec02..33be2b1782dc 100644
--- a/crates/polars-plan/src/logical_plan/conversion.rs
+++ b/crates/polars-plan/src/logical_plan/conversion.rs
@@ -128,12 +128,10 @@ pub fn to_aexpr(expr: Expr, arena: &mut Arena<AExpr>) -> Node {
         Expr::Window {
             function,
             partition_by,
-            order_by,
             options,
         } => AExpr::Window {
             function: to_aexpr(*function, arena),
             partition_by: to_aexprs(partition_by, arena),
-            order_by: order_by.map(|ob| to_aexpr(*ob, arena)),
             options,
         },
         Expr::Slice {
@@ -565,16 +563,13 @@ pub fn node_to_expr(node: Node, expr_arena: &Arena<AExpr>) -> Expr {
         AExpr::Window {
             function,
             partition_by,
-            order_by,
             options,
         } => {
             let function = Box::new(node_to_expr(function, expr_arena));
             let partition_by = nodes_to_exprs(&partition_by, expr_arena);
-            let order_by = order_by.map(|ob| Box::new(node_to_expr(ob, expr_arena)));
             Expr::Window {
                 function,
                 partition_by,
-                order_by,
                 options,
             }
         },
diff --git a/crates/polars-plan/src/logical_plan/iterator.rs b/crates/polars-plan/src/logical_plan/iterator.rs
index adb333804b35..2e90462a4da7 100644
--- a/crates/polars-plan/src/logical_plan/iterator.rs
+++ b/crates/polars-plan/src/logical_plan/iterator.rs
@@ -68,15 +68,11 @@ macro_rules! push_expr {
             Window {
                 function,
                 partition_by,
-                order_by,
                 ..
             } => {
                 for e in partition_by.into_iter().rev() {
                     $push(e)
                 }
-                if let Some(e) = order_by {
-                    $push(e);
-                }
                 // latest so that it is popped first
                 $push(function);
             },