diff --git a/test/integration/getserversideprops-preview/test/index.test.js b/test/integration/getserversideprops-preview/test/index.test.js
index 7c7f68bbdf063d5..ff42f77db3a4c39 100644
--- a/test/integration/getserversideprops-preview/test/index.test.js
+++ b/test/integration/getserversideprops-preview/test/index.test.js
@@ -197,6 +197,7 @@ describe('ServerSide Props Preview Mode', () => {
 
     it('should return cookies to be expired after dev server reboot', async () => {
       await killApp(app)
+      appPort = await findPort()
       app = await launchApp(appDir, appPort)
 
       const res = await fetchViaHTTP(