diff --git a/src/components/ha-cards.html b/src/components/ha-cards.html
index 557a5e6380..adac69c08b 100644
--- a/src/components/ha-cards.html
+++ b/src/components/ha-cards.html
@@ -5,7 +5,7 @@
 <link rel="import" href="../cards/ha-card-chooser.html">
 
 <dom-module id="ha-cards">
-  <style is="custom-style" include="iron-flex"></style>
+  <style is="custom-style" include="iron-flex iron-flex-factors"></style>
   <style>
     :host {
       display: block;