diff --git a/test/integration/image-optimizer/app/public/png-as-octet-stream b/test/integration/image-optimizer/app/public/png-as-octet-stream
new file mode 100644
index 0000000000000..e14fafc5cf3bc
Binary files /dev/null and b/test/integration/image-optimizer/app/public/png-as-octet-stream differ
diff --git a/test/integration/image-optimizer/test/index.test.js b/test/integration/image-optimizer/test/index.test.js
index 2446330e528e5..5bd360511b22c 100644
--- a/test/integration/image-optimizer/test/index.test.js
+++ b/test/integration/image-optimizer/test/index.test.js
@@ -478,9 +478,8 @@ function runTests({
     })
 
     it('should automatically detect image type when content-type is octet-stream', async () => {
-      const url =
-        'https://image-optimization-test.vercel.app/png-as-octet-stream'
-      const resOrig = await fetch(url)
+      const url = '/png-as-octet-stream'
+      const resOrig = await fetchViaHTTP(appPort, url)
       expect(resOrig.status).toBe(200)
       expect(resOrig.headers.get('Content-Type')).toBe(
         'application/octet-stream'