diff --git a/lib/util.js b/lib/util.js
index 06c2d20..8483b9c 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -31,9 +31,6 @@ const execOptsWin = {
   encoding: 'UTF-8'
 };
 
-let _cores = 0;
-let wmic = '';
-
 function isFunction(functionToCheck) {
   let getType = {};
   return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';