diff --git a/lib/utils.js b/lib/utils.js
index 2abaaf5a..b73e8078 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -158,6 +158,9 @@ exports.cache = {
   get: function (key) {
     return this._data[key];
   },
+  remove: function (key) {
+    delete this._data[key];
+  },
   reset: function () {
     this._data = {};
   }