diff --git a/.changeset/rare-ears-agree.md b/.changeset/rare-ears-agree.md
new file mode 100644
index 0000000000..392d32c786
--- /dev/null
+++ b/.changeset/rare-ears-agree.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: update client check for smaller bundle size
diff --git a/packages/svelte/src/internal/client/timing.js b/packages/svelte/src/internal/client/timing.js
index 3b9e5c511d..dc7d2ce4ed 100644
--- a/packages/svelte/src/internal/client/timing.js
+++ b/packages/svelte/src/internal/client/timing.js
@@ -1,11 +1,11 @@
 /** @import { Raf } from '#client' */
 import { noop } from '../shared/utils.js';
 
-const is_client = typeof window !== 'undefined';
+import { BROWSER } from 'esm-env';
 
-const request_animation_frame = is_client ? requestAnimationFrame : noop;
+const request_animation_frame = BROWSER ? requestAnimationFrame : noop;
 
-const now = is_client ? () => performance.now() : () => Date.now();
+const now = BROWSER ? () => performance.now() : () => Date.now();
 
 /** @type {Raf} */
 export const raf = {