diff --git a/javascripts/application.js b/javascripts/application.js
index 8dc62dd3e..4277e5fb7 100644
--- a/javascripts/application.js
+++ b/javascripts/application.js
@@ -9,6 +9,23 @@
 
 let normalized = false;
 
+// String.includes function polyfill
+// to add compatibility with older browsers
+if ( !String.prototype.includes ) {
+  String.prototype.includes = function(search, start) {
+    'use strict';
+    if (typeof start !== 'number') {
+      start = 0;
+    } 
+
+    if (start + search.length > this.length) {
+      return false;
+    } else {
+      return this.indexOf(search,start) !== -1;
+    }
+  };
+}
+
 function setupProjectInput() {
   $(config.projectInput).on('change', function () {
     if(!this.value) {