diff --git a/app/helpers/instance_helper.rb b/app/helpers/instance_helper.rb
index 70027cca9..22a19c52b 100644
--- a/app/helpers/instance_helper.rb
+++ b/app/helpers/instance_helper.rb
@@ -6,6 +6,6 @@ module InstanceHelper
   end
 
   def site_hostname
-    Rails.configuration.x.local_domain
+    @site_hostname ||= Addressable::URI.parse("//#{Rails.configuration.x.local_domain}").display_uri.host
   end
 end