diff --git a/config/initializers/session_store.rb b/config/initializers/session_store.rb
index 21efdd6aae..4b6ab9519e 100644
--- a/config/initializers/session_store.rb
+++ b/config/initializers/session_store.rb
@@ -5,7 +5,7 @@
 # (create the session table with "rails generate session_migration")
 
 domain = if Rails.env.staging? || Rails.env.production?
-           ".#{ENV['SITE_URL'].gsub(/^(www\.)/, '')}"
+           ".#{ENV['SITE_URL']}"
          else
            :all
          end