diff --git a/lib/ProcessUtils.js b/lib/ProcessUtils.js
index 95edd4b0..1f0b7703 100644
--- a/lib/ProcessUtils.js
+++ b/lib/ProcessUtils.js
@@ -1,3 +1,5 @@
+'use strict'
+
 module.exports = {
   injectModules: function() {
     if (process.env.pmx !== 'false') {