diff --git a/config/environments/preproduction.rb b/config/environments/preproduction.rb
index 17103a67c..3c21e58c7 100644
--- a/config/environments/preproduction.rb
+++ b/config/environments/preproduction.rb
@@ -30,7 +30,7 @@ Rails.application.configure do
   config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
 
   # 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.
diff --git a/config/environments/production.rb b/config/environments/production.rb
index e0c2d5a75..9fe36cf48 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -24,7 +24,7 @@ Rails.application.configure do
   config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
 
   # 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.
diff --git a/config/environments/staging.rb b/config/environments/staging.rb
index ec77bac43..c189f787c 100644
--- a/config/environments/staging.rb
+++ b/config/environments/staging.rb
@@ -30,7 +30,7 @@ Rails.application.configure do
   config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
 
   # 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.