diff --git a/scripts/prepare-package.js b/scripts/prepare-package.js
index 0020e8f8ae..71fd237600 100644
--- a/scripts/prepare-package.js
+++ b/scripts/prepare-package.js
@@ -394,10 +394,11 @@ if (chromeDevtoolsMcpPackageJson) {
   if (!installRoot || !existsSync(patchDir)) {
     process.exit(0);
   }
+  const relativePatchDir = path.relative(installRoot, patchDir) || '.';
   const patchPackageBin = require.resolve('patch-package/index.js');
   const result = spawnSync(
     process.execPath,
-    [patchPackageBin, '--patch-dir', patchDir, '--error-on-fail'],
+    [patchPackageBin, '--patch-dir', relativePatchDir, '--error-on-fail'],
     { cwd: installRoot, stdio: 'inherit' },
   );
   if (result.signal) {
diff --git a/scripts/tests/package-assets.test.js b/scripts/tests/package-assets.test.js
index d90e89895b..db99b734cd 100644
--- a/scripts/tests/package-assets.test.js
+++ b/scripts/tests/package-assets.test.js
@@ -229,11 +229,7 @@ describe('package asset scripts', () => {
 
     const realDistDir = realpathSync(distDir);
     expect(JSON.parse(readFileSync(markerPath, 'utf8'))).toEqual({
-      argv: [
-        '--patch-dir',
-        path.join(realDistDir, 'patches'),
-        '--error-on-fail',
-      ],
+      argv: ['--patch-dir', 'patches', '--error-on-fail'],
       cwd: realDistDir,
     });
   });