diff --git a/app/views/layouts/phone.html.slim b/app/views/layouts/phone.html.slim
index e33c7c52..0d76b2ae 100644
--- a/app/views/layouts/phone.html.slim
+++ b/app/views/layouts/phone.html.slim
@@ -18,6 +18,7 @@ html lang="en"
     link href="images/apple-touch-icon.png" rel="apple-touch-icon-precomposed"
     link href="images/favicon.ico" rel="shortcut icon"
     javascript:
+      var QMobile;
       // Dummy holder when Qmobile object is not supplied by the mobile phone
       QMobile || (QMobile = {
         scanQr: function(){window.location = '/select_qrcode'}