diff --git a/tests/playwright-test/reporter-json.spec.ts b/tests/playwright-test/reporter-json.spec.ts
index 79eb3c8296..27910e40ca 100644
--- a/tests/playwright-test/reporter-json.spec.ts
+++ b/tests/playwright-test/reporter-json.spec.ts
@@ -333,19 +333,20 @@ test('should report parallelIndex', async ({ runInlineTest }, testInfo) => {
     'tests/a.spec.js': `
       import { test, expect } from '@playwright/test';
       const fs = require('fs');
+      test.describe.configure({ mode: 'parallel' });
       test('test 1 passes!', async ({}) => {});
       test('test 2 fails!', async ({}) => {
         expect(1 + 1).toBe(3);
       });
       test('test 3 passes!', async ({}) => {});
     `
-  }, { 'workers': '1', 'reporter': 'json' });
+  }, { 'workers': '2', 'reporter': 'json' });
   expect(result.passed).toBe(2);
   expect(result.failed).toBe(1);
   expect(result.report.suites[0].specs[0].tests[0].results[0].workerIndex).toBe(0);
-  expect(result.report.suites[0].specs[1].tests[0].results[0].workerIndex).toBe(0);
-  expect(result.report.suites[0].specs[2].tests[0].results[0].workerIndex).toBe(1);
+  expect(result.report.suites[0].specs[1].tests[0].results[0].workerIndex).toBe(1);
+  expect(result.report.suites[0].specs[2].tests[0].results[0].workerIndex).toBe(0);
   expect(result.report.suites[0].specs[0].tests[0].results[0].parallelIndex).toBe(0);
-  expect(result.report.suites[0].specs[1].tests[0].results[0].parallelIndex).toBe(0);
+  expect(result.report.suites[0].specs[1].tests[0].results[0].parallelIndex).toBe(1);
   expect(result.report.suites[0].specs[2].tests[0].results[0].parallelIndex).toBe(0);
 });