diff --git a/app/views/layouts/header/_default.html.haml b/app/views/layouts/header/_default.html.haml
index e7fc83a8d04e22359706a1cbb408ce77b6ddd460..fc8ebdd13e2050af563c8385131fbd37d7f543b5 100644
--- a/app/views/layouts/header/_default.html.haml
+++ b/app/views/layouts/header/_default.html.haml
@@ -71,7 +71,7 @@
           - else
             %li
               %div
-                = link_to "Sign in / Register", new_session_path(:user, redirect_to_referer: 'yes'), class: 'btn btn-sign-in'
+                = link_to "Sign in", omniauth_authorize_path(:user, :cas3), method: :post, class: 'btn btn-sign-in', "data-no-turbolink" => "true"
 
       %button.navbar-toggle.hidden-sm.hidden-md.hidden-lg{ type: 'button' }
         %span.sr-only Toggle navigation