5 files changed, 20 insertions, 1 deletions
diff --git a/actionpack/lib/abstract_controller.rb b/actionpack/lib/abstract_controller.rb
index c565c940a1..f8fc79936f 100644
--- a/actionpack/lib/abstract_controller.rb
+++ b/actionpack/lib/abstract_controller.rb
@@ -2,6 +2,7 @@ activesupport_path = File.expand_path('../../../activesupport/lib', __FILE__)
 $:.unshift(activesupport_path) if File.directory?(activesupport_path) && !$:.include?(activesupport_path)
 
 require 'action_pack'
+require 'active_support/concern'
 require 'active_support/ruby/shim'
 require 'active_support/dependencies/autoload'
 require 'active_support/core_ext/class/attribute'
diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index 165bf089c0..d8d3a2335a 100644
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -223,7 +223,7 @@ module ActionController
 
     def self.inherited(klass)
       super
-      klass.helper :all
+      klass.helper :all if klass.superclass == ActionController::Base
     end
 
     ActiveSupport.run_load_hooks(:action_controller, self)
diff --git a/actionpack/test/controller/helper_test.rb b/actionpack/test/controller/helper_test.rb
index ad66f138eb..4f8ff4140f 100644
--- a/actionpack/test/controller/helper_test.rb
+++ b/actionpack/test/controller/helper_test.rb
@@ -25,6 +25,13 @@ class AllHelpersController < ActionController::Base
   helper :all
 end
 
+class JustMeController < ActionController::Base
+  clear_helpers
+end
+
+class MeTooController < JustMeController
+end
+
 module LocalAbcHelper
   def a() end
   def b() end
@@ -92,6 +99,11 @@ class HelperTest < ActiveSupport::TestCase
     # assert_equal 'test: baz', Fun::PdfController.process(request, response).body
   end
 
+  def test_default_helpers_only
+    assert_equal [JustMeHelper], JustMeController._helpers.ancestors.reject(&:anonymous?)
+    assert_equal [MeTooHelper, JustMeHelper], MeTooController._helpers.ancestors.reject(&:anonymous?)
+  end
+
   def test_all_helpers
     methods = AllHelpersController._helpers.instance_methods.map {|m| m.to_s}
 
diff --git a/actionpack/test/fixtures/helpers/just_me_helper.rb b/actionpack/test/fixtures/helpers/just_me_helper.rb
new file mode 100644
index 0000000000..b140a7b9b4
--- /dev/null
+++ b/actionpack/test/fixtures/helpers/just_me_helper.rb
@@ -0,0 +1,3 @@
+module JustMeHelper
+  def me() "mine!" end
+end
+\ No newline at end of file
diff --git a/actionpack/test/fixtures/helpers/me_too_helper.rb b/actionpack/test/fixtures/helpers/me_too_helper.rb
new file mode 100644
index 0000000000..ce56042143
--- /dev/null
+++ b/actionpack/test/fixtures/helpers/me_too_helper.rb
@@ -0,0 +1,3 @@
+module MeTooHelper
+  def me() "me too!" end
+end
+\ No newline at end of file