diff --git a/src/compiler/compile/render_dom/wrappers/Element/Binding.ts b/src/compiler/compile/render_dom/wrappers/Element/Binding.ts
index d3a40128c4..471607a9e3 100644
--- a/src/compiler/compile/render_dom/wrappers/Element/Binding.ts
+++ b/src/compiler/compile/render_dom/wrappers/Element/Binding.ts
@@ -72,7 +72,7 @@ export default class BindingWrapper {
 
 	get_update_dependencies() {
 		const object = get_object(this.node.expression.node).name;
-		const dependencies = new Set();
+		const dependencies = new Set<string>();
 		dependencies.add(object);