diff --git a/config/environments/production.rb b/config/environments/production.rb
index 6ba222e787..b719d3dd86 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -50,9 +50,12 @@ OpenProject::Application.configure do
   # config.action_controller.asset_host = "http://assets.example.com"
 
   # Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
-  config.assets.precompile += %w( default.css select_list_move.js copy_issue_actions.js repository_navigation.js
+  config.assets.precompile += %w( default.css
+                                  ie6.css ie7.css
+                                  rtl.css context_menu_rtl.css
                                   accessibility.js accessibility.css
-                                  jstoolbar/lang/*.js )
+                                  copy_issue_actions.js repository_navigation.js select_list_move.js
+                                  jstoolbar/lang/*.js calendar/lang/*.js )
 
   # Disable delivery errors, bad email addresses will be ignored
   # config.action_mailer.raise_delivery_errors = false