diff --git a/resources/assets/js/pages/page-form.js b/resources/assets/js/pages/page-form.js
index 81d1cdea6..f6f66beb4 100644
--- a/resources/assets/js/pages/page-form.js
+++ b/resources/assets/js/pages/page-form.js
@@ -120,7 +120,7 @@ function codePlugin() {
         $codeMirrorContainer.replaceWith($pre);
     }
 
-    window.tinymce.PluginManager.add('codeeditor', (editor, url) => {
+    window.tinymce.PluginManager.add('codeeditor', function(editor, url) {
 
         let $ = editor.$;