diff --git a/src/runtime/ssr.js b/src/runtime/ssr.js
index a554968229..80b38ae0f4 100644
--- a/src/runtime/ssr.js
+++ b/src/runtime/ssr.js
@@ -8,10 +8,13 @@ export {
 	createEventDispatcher,
 	SvelteComponent,
 	SvelteComponentTyped
-} from './index';
+} from './index.js';
+
 /** @returns {void} */
 export function onMount() {}
+
 /** @returns {void} */
 export function beforeUpdate() {}
+
 /** @returns {void} */
 export function afterUpdate() {}