diff --git a/src/compiler/compile/nodes/Element.ts b/src/compiler/compile/nodes/Element.ts
index 99b132e5a8..b9d2672168 100644
--- a/src/compiler/compile/nodes/Element.ts
+++ b/src/compiler/compile/nodes/Element.ts
@@ -425,7 +425,7 @@ export default class Element extends Node {
 
 	validate_special_cases() {
 		const { component,attributes } = this;
-		let attribute_map = new Map();
+		const attribute_map = new Map();
 
 		attributes.forEach(attribute => (
 			attribute_map.set(attribute.name, attribute)