diff --git a/packages/codemod/test/v1-to-v2/packageJsonUpdater.test.ts b/packages/codemod/test/v1-to-v2/packageJsonUpdater.test.ts
index 75bd4877d0..6f45c7c9b6 100644
--- a/packages/codemod/test/v1-to-v2/packageJsonUpdater.test.ts
+++ b/packages/codemod/test/v1-to-v2/packageJsonUpdater.test.ts
@@ -232,11 +232,16 @@ describe('run() manifest integration', () => {
             "import { Client } from '@modelcontextprotocol/sdk/client/index.js';\nexport { Client };\n"
         );
         // A cycle: src/loop -> the project root.
-        symlinkSync(dir, path.join(dir, 'src', 'loop'), 'dir');
+        // Creating a 'dir' symlink on Windows requires admin rights or
+        // Developer Mode; a junction does not and still forms the cycle.
+        symlinkSync(dir, path.join(dir, 'src', 'loop'), process.platform === 'win32' ? 'junction' : 'dir');
 
         const result = run(v1ToV2Migration, { targetDir: dir, dryRun: false });
 
         // The symlinked re-entry must not be followed: exactly one source file seen.
+        // (If the guard ever regressed, a manual mutation run on Windows would report 64
+        // entries here — 63 resolvable reparse-point levels plus the one that fails — and
+        // a second nested junction would halve the count to 32.)
         expect(result.fileResults.map(fr => fr.filePath)).toHaveLength(1);
         expect(result.packageJsonChanges?.[0]?.applied).toBe(true);
         expect(result.packageJsonChanges?.[0]?.removed).toEqual(['@modelcontextprotocol/sdk']);