diff --git a/config/initializers/session_store.rb b/config/initializers/session_store.rb
index 799c1d3986..5bc8dc7b2a 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\.)|^(app\.)|^(staging\.)|^(stg\.)/, '')}"
+           ENV['SITE_URL']
          else
            :all
          end