diff --git a/packages/svelte/src/internal/client/hydration.js b/packages/svelte/src/internal/client/hydration.js
index ea7eac73f4bb..e7643a57cc60 100644
--- a/packages/svelte/src/internal/client/hydration.js
+++ b/packages/svelte/src/internal/client/hydration.js
@@ -1,6 +1,6 @@
 // Handle hydration
 
-import { schedule_task } from './runtime';
+import { schedule_task } from './runtime.js';
 
 /** @type {null | Array<Text | Comment | Element>} */
 export let current_hydration_fragment = null;