diff --git a/lib/runner/concurrency/index.js b/lib/runner/concurrency/index.js
index b2924b3e32..6e0ffb0b71 100644
--- a/lib/runner/concurrency/index.js
+++ b/lib/runner/concurrency/index.js
@@ -231,8 +231,8 @@ class Concurrency extends EventEmitter {
    * @param {function} fn
    */
   static buildProcessQueue(maxWorkers, modules, fn) {
-    const queue = modules;
-    
+    const queue = modules.slice(0);
+
     let workers = 0;
     let index = 0;