diff --git a/config/environments/development.rb b/config/environments/development.rb
index 474ed765..5d60ba96 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -119,6 +119,5 @@ Osem::Application.configure do
     end
   end
 
-  config.assets.precompile += ['mailbot.css']
   config.active_record.verbose_query_logs = true
 end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 651ab938..96686b40 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -52,8 +52,6 @@ Osem::Application.configure do
     ActiveSupport::Deprecation.silenced = true
   end
 
-  config.assets.precompile += ['mailbot.css']
-
   # Test email address
   config.mailbot = {
     bcc_address: 'test@test.com'
diff --git a/config/initializers/assets.rb b/config/initializers/assets.rb
index 01ef3e66..6ed78e1a 100644
--- a/config/initializers/assets.rb
+++ b/config/initializers/assets.rb
@@ -9,3 +9,4 @@ Rails.application.config.assets.version = '1.0'
 # Precompile additional assets.
 # application.js, application.css, and all non-JS/CSS in app/assets folder are already added.
 # Rails.application.config.assets.precompile += %w( search.js )
+Rails.application.config.assets.precompile += ['mailbot.css']