diff --git a/actionmailer/test/abstract_unit.rb b/actionmailer/test/abstract_unit.rb
index af6f1bc92ebd5..50b8a530068f0 100644
--- a/actionmailer/test/abstract_unit.rb
+++ b/actionmailer/test/abstract_unit.rb
@@ -10,7 +10,6 @@
 require 'test/unit'
 
 require 'action_mailer'
-require 'action_mailer/test_case'
 
 # Show backtraces for deprecated behavior for quicker cleanup.
 ActiveSupport::Deprecation.debug = true
diff --git a/railties/lib/rails/test_help.rb b/railties/lib/rails/test_help.rb
index 696b65f8bf184..c1e7334ab8d59 100644
--- a/railties/lib/rails/test_help.rb
+++ b/railties/lib/rails/test_help.rb
@@ -8,7 +8,6 @@
 require 'test/unit'
 require 'active_support/core_ext/kernel/requires'
 
-require 'action_mailer/test_case' if defined?(ActionMailer)
 require 'active_model/test_case'  if defined?(ActiveModel)
 
 if defined?(ActiveRecord)