diff --git a/Changes.md b/Changes.md
index 621818bf..2c2dfe8b 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,3 +1,8 @@
+HEAD
+-----------
+
+- Remove option to disable Rails hooks. [#401]
+
 2.3.2
 -----------
 
diff --git a/lib/sidekiq.rb b/lib/sidekiq.rb
index 8e99e6c0..4671acf0 100644
--- a/lib/sidekiq.rb
+++ b/lib/sidekiq.rb
@@ -23,7 +23,6 @@ module Sidekiq
     :require => '.',
     :environment => nil,
     :timeout => 8,
-    :enable_rails_extensions => true,
   }
 
   def self.options
diff --git a/lib/sidekiq/rails.rb b/lib/sidekiq/rails.rb
index 8d2563fd..42387d71 100644
--- a/lib/sidekiq/rails.rb
+++ b/lib/sidekiq/rails.rb
@@ -1,12 +1,11 @@
 module Sidekiq
   def self.hook_rails!
-    return unless Sidekiq.options[:enable_rails_extensions]
-    if defined?(ActiveRecord)
-      ActiveRecord::Base.send(:include, Sidekiq::Extensions::ActiveRecord)
+    if defined?(::ActiveRecord)
+      ::ActiveRecord::Base.send(:include, Sidekiq::Extensions::ActiveRecord)
     end
 
-    if defined?(ActionMailer)
-      ActionMailer::Base.extend(Sidekiq::Extensions::ActionMailer)
+    if defined?(::ActionMailer)
+      ::ActionMailer::Base.extend(Sidekiq::Extensions::ActionMailer)
     end
   end
 
diff --git a/test/test_extensions.rb b/test/test_extensions.rb
index ff0206ff..4ce60d10 100644
--- a/test/test_extensions.rb
+++ b/test/test_extensions.rb
@@ -64,27 +64,4 @@ class TestExtensions < MiniTest::Unit::TestCase
       SomeClass.delay.doit(Date.today)
     end
   end
-
-  describe 'sidekiq rails extensions configuration' do
-    before do
-      @options = Sidekiq.options
-    end
-
-    after do
-      Sidekiq.options = @options
-    end
-
-    it 'should set enable_rails_extensions option to true by default' do
-      assert Sidekiq.options[:enable_rails_extensions]
-    end
-
-    it 'should extend ActiveRecord and ActiveMailer if enable_rails_extensions is true' do
-      assert Sidekiq.hook_rails!
-    end
-
-    it 'should not extend ActiveRecord and ActiveMailer if enable_rails_extensions is false' do
-      Sidekiq.options = { :enable_rails_extensions => false }
-      refute Sidekiq.hook_rails!
-    end
-  end
 end