diff --git a/lib/module.js b/lib/module.js
index f40a9aebb1592e..bd6af190f642b1 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -69,9 +69,9 @@ function Module(id, parent) {
 }
 module.exports = Module;
 
-Module._cache = {};
-Module._pathCache = {};
-Module._extensions = {};
+Module._cache = Object.create(null);
+Module._pathCache = Object.create(null);
+Module._extensions = Object.create(null);
 var modulePaths = [];
 Module.globalPaths = [];