diff --git a/HISTORY.md b/HISTORY.md
index 8f464d6..91e8562 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -13,6 +13,8 @@ https://github.com/josdejong/jsoneditor
   in `text` and `code` mode.
 - Implemented repairing JSON objects containing special white space
   characters like non-breaking space.
+- Fixed #481: A polyfill required `DocumentType` which is not defined
+  in all environments.
 
 
 ## 2017-09-16, version 5.9.6
diff --git a/src/js/util.js b/src/js/util.js
index 90b4d27..ed7e42a 100644
--- a/src/js/util.js
+++ b/src/js/util.js
@@ -872,8 +872,8 @@ exports.getInputSelection = function(el) {
 
 if (typeof Element !== 'undefined') {
   // Polyfill for array remove
-  (function (arr) {
-    arr.forEach(function (item) {
+  (function () {
+    function polyfill (item) {
       if (item.hasOwnProperty('remove')) {
         return;
       }
@@ -886,8 +886,12 @@ if (typeof Element !== 'undefined') {
             this.parentNode.removeChild(this);
         }
       });
-    });
-  })([Element.prototype, CharacterData.prototype, DocumentType.prototype]);
+    }
+
+    if (typeof Element !== 'undefined')       { polyfill(Element.prototype); }
+    if (typeof CharacterData !== 'undefined') { polyfill(CharacterData.prototype); }
+    if (typeof DocumentType !== 'undefined')  { polyfill(DocumentType.prototype); }
+  })();
 }