diff --git a/src/compiler/compile/Component.ts b/src/compiler/compile/Component.ts
index 15f125eebf..53b66ce024 100644
--- a/src/compiler/compile/Component.ts
+++ b/src/compiler/compile/Component.ts
@@ -802,7 +802,7 @@ export default class Component {
 							const { name } = arg;
 							if (scope.find_owner(name) === instance_scope) {
 								const variable = component.var_lookup.get(name);
-								variable['argument'] = true;
+								variable.aliased = true;
 							}
 						}
 					});
@@ -1137,7 +1137,7 @@ export default class Component {
 		for (const [name, node] of top_level_function_declarations) {
 			if (is_hoistable(node)) {
 				const variable = this.var_lookup.get(name);
-				if (!('argument' in variable && variable.argument)) {
+				if (!variable.aliased) {
 					variable.hoistable = true;
 					hoistable_nodes.add(node);
 
diff --git a/src/compiler/interfaces.ts b/src/compiler/interfaces.ts
index 78ff9fa449..e0b26e16fe 100644
--- a/src/compiler/interfaces.ts
+++ b/src/compiler/interfaces.ts
@@ -160,5 +160,5 @@ export interface Var {
 	hoistable?: boolean;
 	subscribable?: boolean;
 	is_reactive_dependency?: boolean;
-	argument?: boolean;
+	aliased?: boolean;
 }
\ No newline at end of file