diff --git a/docker-assets/config/environments/production.rb b/docker-assets/config/environments/production.rb
index 4814f3c..80b52bb 100644
--- a/docker-assets/config/environments/production.rb
+++ b/docker-assets/config/environments/production.rb
@@ -23,7 +23,7 @@
   config.serve_static_files = 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.