diff --git a/tests/main.test.ts b/tests/main.test.ts
index 71e0b4d..f07cb85 100644
--- a/tests/main.test.ts
+++ b/tests/main.test.ts
@@ -1,7 +1,6 @@
 import {beforeEach, describe, expect, it}          from '@jest/globals';
 import {Filename, ppath, xfs, npath, PortablePath} from '@yarnpkg/fslib';
 import os                                          from 'node:os';
-import path                                        from 'node:path';
 import process                                     from 'node:process';
 
 import config                                      from '../config.json';
@@ -421,8 +420,7 @@ it(`should refuse to run a different package manager within a configured project
 
     await expect(runCli(cwd, [`pnpm`, `--version`])).resolves.toMatchObject({
       stdout: `Usage Error: This project is configured to use yarn because ${
-        // ppath and xfs do not format Windows correctly, the regex fixes that:
-        path.join(cwd.replace(/^\/([a-zA-Z]:)\//, `$1\\`), `package.json`)
+        npath.fromPortablePath(ppath.join(cwd, `package.json` as Filename))
       } has a "packageManager" field\n\n$ pnpm ...\n`,
       exitCode: 1,
     });