diff --git a/dev-packages/e2e-tests/test-applications/sveltekit-2.5.0-twp/tests/sdk.test.ts b/dev-packages/e2e-tests/test-applications/sveltekit-2.5.0-twp/tests/sdk.test.ts
index c1131913d057..435b9fe48cb8 100644
--- a/dev-packages/e2e-tests/test-applications/sveltekit-2.5.0-twp/tests/sdk.test.ts
+++ b/dev-packages/e2e-tests/test-applications/sveltekit-2.5.0-twp/tests/sdk.test.ts
@@ -4,12 +4,10 @@ test.describe('SDK-internal behavior', () => {
   test('Injects fetch proxy script for SvelteKit<2.16.0', async ({ page }) => {
     await page.goto('/');
 
-    const sentryCarrier = await page.evaluate('typeof window.__SENTRY__');
+    // @ts-expect-error this is defined
+    await page.waitForFunction(() => typeof window.__SENTRY__ === 'object');
     const proxyHandle = await page.evaluate('typeof window._sentryFetchProxy');
 
-    // sanity check
-    expect(sentryCarrier).toBe('object');
-
     // fetch proxy script ran
     expect(proxyHandle).toBe('function');
   });
diff --git a/dev-packages/e2e-tests/test-applications/sveltekit-2/tests/sdk.test.ts b/dev-packages/e2e-tests/test-applications/sveltekit-2/tests/sdk.test.ts
index f35a81e91238..8633439eb503 100644
--- a/dev-packages/e2e-tests/test-applications/sveltekit-2/tests/sdk.test.ts
+++ b/dev-packages/e2e-tests/test-applications/sveltekit-2/tests/sdk.test.ts
@@ -4,11 +4,11 @@ import { waitForInitialPageload } from './utils';
 test.describe('SDK-internal behavior', () => {
   test("Doesn't inject fetch proxy script for SvelteKit>=2.16.0", async ({ page }) => {
     await waitForInitialPageload(page, { route: '/' });
-    const sentryCarrier = await page.evaluate('typeof window.__SENTRY__');
-    const proxyHandle = await page.evaluate('typeof window._sentryFetchProxy');
 
-    // sanity check
-    expect(sentryCarrier).toBe('object');
+    // @ts-expect-error this is defined
+    await page.waitForFunction(() => typeof window.__SENTRY__ === 'object');
+
+    const proxyHandle = await page.evaluate('typeof window._sentryFetchProxy');
 
     // fetch proxy script didn't run
     expect(proxyHandle).toBe('undefined');