diff --git a/plugin.rb b/plugin.rb
index d4c04a99..6e26bcee 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -18,6 +18,7 @@ config.assets.paths << "#{plugin_asset_path}/stylesheets/wizard"
 
 if Rails.env.production?
   config.assets.precompile += %w{
+    wizard-preload.js
     wizard-custom-guest.js
     wizard-custom-lib.js
     wizard-custom.js