diff --git a/packages/playwright-test/src/cli.ts b/packages/playwright-test/src/cli.ts
index 9818ebca82..b0ea525655 100644
--- a/packages/playwright-test/src/cli.ts
+++ b/packages/playwright-test/src/cli.ts
@@ -170,10 +170,11 @@ async function runTests(args: string[], opts: { [key: string]: any }) {
 async function listTests(opts: { [key: string]: any }) {
   const configFile = opts.config ? path.resolve(process.cwd(), opts.config) : process.cwd();
   const runner = new Runner({}, { defaultConfig: {} });
-  await runner.loadConfigFromFile(configFile);
-  const report = await runner.listAllTestFiles(opts.project);
-  process.stdout.write(JSON.stringify(report));
-  process.exit(0);
+  const config = await runner.loadConfigFromFile(configFile);
+  const report = await runner.listAllTestFiles(config, opts.project);
+  process.stdout.write(JSON.stringify(report), () => {
+    process.exit(0);
+  });
 }
 
 function forceRegExp(pattern: string): RegExp {
diff --git a/packages/playwright-test/src/runner.ts b/packages/playwright-test/src/runner.ts
index db6d63a84b..1ee15e3e57 100644
--- a/packages/playwright-test/src/runner.ts
+++ b/packages/playwright-test/src/runner.ts
@@ -163,9 +163,10 @@ export class Runner {
     }
   }
 
-  async listAllTestFiles(projectNames: string[] | undefined): Promise<any> {
+  async listAllTestFiles(config: Config, projectNames: string[] | undefined): Promise<any> {
     const filesByProject = await this._collectFiles([], projectNames);
     const report: any = {
+      testDir: config.testDir,
       projects: []
     };
     for (const [project, files] of filesByProject) {