diff --git a/src/protocol/ast.rs b/src/protocol/ast.rs
index 47e5960bf8ccb2cbcb5c595aafe2d6ec02c81623..d252810ebdbe8cd7fc9266f18c237d2cb10fc5e3 100644
--- a/src/protocol/ast.rs
+++ b/src/protocol/ast.rs
@@ -1877,6 +1877,7 @@ pub struct VariableExpression {
     pub identifier: Identifier,
     // Validator/Linker
     pub declaration: Option<VariableId>,
+    pub used_as_binding_target: bool,
     pub parent: ExpressionParent,
     pub unique_id_in_definition: i32,
 }
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