diff --git a/src/internal/Component.js b/src/internal/Component.js
index 43c0c62ca9..0679b63023 100644
--- a/src/internal/Component.js
+++ b/src/internal/Component.js
@@ -115,7 +115,7 @@ export function init(component, options, instance, create_fragment, not_equal, p
 export let SvelteElement;
 if (typeof HTMLElement !== 'undefined') {
 	SvelteElement = class extends HTMLElement {
-		constructor({ use_shadow_dom = true } = {}) {
+		constructor({ use_shadow_dom = true } = { use_shadow_dom: true }) {
 			super();
 			if (use_shadow_dom) {
 				this.attachShadow({ mode: 'open' });