diff --git a/tests/page/page-request-fulfill.spec.ts b/tests/page/page-request-fulfill.spec.ts
index d9dd74c45f..3fab893ba0 100644
--- a/tests/page/page-request-fulfill.spec.ts
+++ b/tests/page/page-request-fulfill.spec.ts
@@ -273,6 +273,7 @@ it('should fulfill with fetch response that has multiple set-cookie', async ({ p
   it.fail(browserName === 'webkit', 'Response contained invalid HTTP headers');
   server.setRoute('/empty.html', (req, res) => {
     res.setHeader('Set-Cookie', ['a=b', 'c=d']);
+    res.setHeader('Content-Type', 'text/html');
     res.end();
   });
   await page.route('**/empty.html', async route => {