diff --git a/js/bootstrap-select.js b/js/bootstrap-select.js
index a1ee4a86a..13e9111b8 100644
--- a/js/bootstrap-select.js
+++ b/js/bootstrap-select.js
@@ -275,24 +275,6 @@
     }());
   }
 
-  if (!Object.keys) {
-    Object.keys = function (
-      o, // object
-      k, // key
-      r  // result array
-    ) {
-      // initialize object and result
-      r = [];
-      // iterate over object keys
-      for (k in o) {
-        // fill result array with non-prototypical keys
-        r.hasOwnProperty.call(o, k) && r.push(k);
-      }
-      // return result
-      return r;
-    };
-  }
-
   if (HTMLSelectElement && !HTMLSelectElement.prototype.hasOwnProperty('selectedOptions')) {
     Object.defineProperty(HTMLSelectElement.prototype, 'selectedOptions', {
       get: function () {