diff --git a/config/environments/staging.rb b/config/environments/staging.rb
index 4ae81535..ba784d88 100644
--- a/config/environments/staging.rb
+++ b/config/environments/staging.rb
@@ -25,7 +25,7 @@ Rails.application.configure do
   config.serve_static_assets = false
 
   # Compress JavaScripts and CSS.
-  config.assets.js_compressor = :uglifier
+  config.assets.js_compressor = Uglifier.new(:harmony => true)
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.