diff --git a/config/environments/production.rb b/config/environments/production.rb
index 2e08f8e029..a780f486fb 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -45,6 +45,7 @@ Openfoodnetwork::Application.configure do
   # Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
   # config.assets.precompile += %w( search.js )
 
+  require 'uglifier'
   config.assets.js_compressor = Uglifier.new(mangle: false)
 
   # Disable delivery errors, bad email addresses will be ignored
diff --git a/config/environments/staging.rb b/config/environments/staging.rb
index bee008922f..ee6fa16e8a 100644
--- a/config/environments/staging.rb
+++ b/config/environments/staging.rb
@@ -45,6 +45,7 @@ Openfoodnetwork::Application.configure do
   # Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
   # config.assets.precompile += %w( search.js )
 
+  require 'uglifier'
   config.assets.js_compressor = Uglifier.new(mangle: false)
 
   # Disable delivery errors, bad email addresses will be ignored