diff --git a/lib/sidekiq/extensions/class_methods.rb b/lib/sidekiq/extensions/class_methods.rb
index 67dd04d7..b3778d7d 100644
--- a/lib/sidekiq/extensions/class_methods.rb
+++ b/lib/sidekiq/extensions/class_methods.rb
@@ -30,4 +30,4 @@ module Sidekiq
   end
 end
 
-Class.send(:include, Sidekiq::Extensions::Klass)
+Module.send(:include, Sidekiq::Extensions::Klass)
diff --git a/test/test_extensions.rb b/test/test_extensions.rb
index 4ce60d10..a239d70d 100644
--- a/test/test_extensions.rb
+++ b/test/test_extensions.rb
@@ -63,5 +63,14 @@ class TestExtensions < MiniTest::Unit::TestCase
     it 'allows delay of any ole class method' do
       SomeClass.delay.doit(Date.today)
     end
+
+    module SomeModule
+      def self.doit(arg)
+      end
+    end
+
+    it 'allows delay of any module class method' do
+      SomeModule.delay.doit(Date.today)
+    end
   end
 end