diff --git a/lib/bootstrap-local.js b/lib/bootstrap-local.js
index f336b5183636..e658d3b02291 100644
--- a/lib/bootstrap-local.js
+++ b/lib/bootstrap-local.js
@@ -42,7 +42,7 @@ require.extensions['.ts'] = function(m, filename) {
 // });
 
 // If we're running locally, meaning npm linked. This is basically "developer mode".
-if (!__dirname.match(/\/node_modules\//)) {
+if (!__dirname.match(new RegExp(`\\${path.sep}node_modules\\${path.sep}`))) {
   const packages = require('./packages');
 
   // We mock the module loader so that we can fake our packages when running locally.