diff --git a/lib/legacy/class.html b/lib/legacy/class.html
index a63c6a16a7..6c27964960 100644
--- a/lib/legacy/class.html
+++ b/lib/legacy/class.html
@@ -8,6 +8,7 @@
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 <link rel="import" href="legacy-element-mixin.html">
+<link rel="import" href="../elements/dom-module.html">
 <script>
 
   (function() {
diff --git a/lib/utils/style-gather.html b/lib/utils/style-gather.html
index e18a347fc2..ca00d43d4f 100644
--- a/lib/utils/style-gather.html
+++ b/lib/utils/style-gather.html
@@ -8,6 +8,7 @@
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 <link rel="import" href="resolve-url.html">
+<link rel="import" href="../elements/dom-module.html">
 <script>
 (function() {
   'use strict';