diff --git a/app/views/application/app.html.erb b/app/views/application/app.html.erb
index 2bc9dc470..e92ab8c83 100644
--- a/app/views/application/app.html.erb
+++ b/app/views/application/app.html.erb
@@ -5,6 +5,8 @@
     <meta content="IE=edge" http-equiv="X-UA-Compatible"/>
     <meta content="width=device-width, initial-scale=1" name="viewport"/>
 
+    <link rel="canonical" href="<%= ENV['APP_HOST'] %>" />
+
     <link href="favicon/apple-touch-icon.png" rel="apple-touch-icon" sizes="180x180"></link>
     <link href="favicon/favicon-32x32.png" rel="icon" sizes="32x32" type="image/png"></link>
     <link href="favicon/favicon-16x16.png" rel="icon" sizes="16x16" type="image/png"></link>