diff --git a/core/variables.js b/core/variables.js
index 2411d3721..173702a7a 100644
--- a/core/variables.js
+++ b/core/variables.js
@@ -32,6 +32,7 @@ goog.provide('Blockly.Variables');
 
 goog.require('Blockly.Blocks');
 goog.require('Blockly.Msg');
+goog.require('Blockly.utils.xml');
 goog.require('Blockly.VariableModel');
 goog.require('Blockly.Xml');
 
diff --git a/core/variables_dynamic.js b/core/variables_dynamic.js
index ab47337bb..a17c79e2a 100644
--- a/core/variables_dynamic.js
+++ b/core/variables_dynamic.js
@@ -30,6 +30,7 @@ goog.provide('Blockly.VariablesDynamic');
 goog.require('Blockly.Variables');
 goog.require('Blockly.Blocks');
 goog.require('Blockly.Msg');
+goog.require('Blockly.utils.xml');
 goog.require('Blockly.VariableModel');
 goog.require('Blockly.Xml');
 
diff --git a/core/xml.js b/core/xml.js
index f5d2abd41..d7461644f 100644
--- a/core/xml.js
+++ b/core/xml.js
@@ -266,8 +266,7 @@ Blockly.Xml.cloneShadow_ = function(shadow) {
       if (node) {
         textNode = node;
         node = node.nextSibling;
-        if (textNode.nodeType == Node.TEXT_NODE &&
-            textNode.data.trim() == '') {
+        if (textNode.nodeType == Node.TEXT_NODE && textNode.data.trim() == '') {
           // Prune whitespace before a tag.
           Blockly.utils.dom.removeNode(textNode);
         }
diff --git a/gulpfile.js b/gulpfile.js
index 9f9f44f4d..c870e1b77 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -67,6 +67,13 @@ if (typeof DOMParser !== 'function') {
     return jsdom.window.document;
   };
 }
+if (typeof Node !== 'function') {
+  var Node = {
+    ELEMENT_NODE: 1,
+    TEXT_NODE: 3,
+    DOCUMENT_POSITION_CONTAINED_BY: 16
+  };
+}
 if (typeof module === 'object') { module.exports = Blockly; }
 if (typeof window === 'object') { window.Blockly = Blockly; }\n`))
       .pipe(gulp.dest('.'));