diff --git a/config/environments/production.rb b/config/environments/production.rb
index 9d110a9ca8..c6bc4902f3 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -55,7 +55,7 @@ Openfoodnetwork::Application.configure do
   # config.assets.precompile += %w( search.js )
 
   require 'uglifier'
-  config.assets.js_compressor = Uglifier.new(mangle: false)
+  config.assets.js_compressor = Uglifier.new(mangle: false, harmony: true)
 
   # Disable delivery errors, bad email addresses will be ignored
   # config.action_mailer.raise_delivery_errors = false
diff --git a/config/environments/staging.rb b/config/environments/staging.rb
index 9d110a9ca8..c6bc4902f3 100644
--- a/config/environments/staging.rb
+++ b/config/environments/staging.rb
@@ -55,7 +55,7 @@ Openfoodnetwork::Application.configure do
   # config.assets.precompile += %w( search.js )
 
   require 'uglifier'
-  config.assets.js_compressor = Uglifier.new(mangle: false)
+  config.assets.js_compressor = Uglifier.new(mangle: false, harmony: true)
 
   # Disable delivery errors, bad email addresses will be ignored
   # config.action_mailer.raise_delivery_errors = false