diff --git a/src/util/ha-pref-storage.html b/src/util/ha-pref-storage.html
index ac31a5eb64..b0b04dbe03 100644
--- a/src/util/ha-pref-storage.html
+++ b/src/util/ha-pref-storage.html
@@ -1,3 +1,5 @@
+<link rel="import" href="../../bower_components/polymer/polymer-element.html">
+
 <script>
 {
   const STORED_STATE = [
diff --git a/src/util/ha-url-sync.html b/src/util/ha-url-sync.html
index 38caac2c54..156ca90677 100644
--- a/src/util/ha-url-sync.html
+++ b/src/util/ha-url-sync.html
@@ -1,3 +1,5 @@
+<link rel="import" href="../../bower_components/polymer/polymer-element.html">
+
 <script>
 {
   /* eslint-disable no-console */