diff --git a/app/index.html b/app/index.html
index 6757df4..88ec72d 100644
--- a/app/index.html
+++ b/app/index.html
@@ -36,7 +36,7 @@
     <meta name="msapplication-TileImage" content="/mstile-144x144.png">
     <meta name="theme-color" content="#ffffff">
 
-    <link rel="stylesheet" href="assets/vendor.css">
+    <link rel="stylesheet" integrity="" href="assets/vendor.css">
     <link rel="stylesheet" href="assets/huegasm.css">
 
     {{content-for 'head-footer'}}