diff --git a/lib/mocha/module_method.rb b/lib/mocha/module_method.rb
index 8f842a87d..1eb6932cd 100644
--- a/lib/mocha/module_method.rb
+++ b/lib/mocha/module_method.rb
@@ -3,14 +3,6 @@
 module Mocha
 
   class ModuleMethod < ClassMethod
-
-    def method_exists?(method)
-      return true if stubbee.public_methods(false).include?(method)
-      return true if stubbee.protected_methods(false).include?(method)
-      return true if stubbee.private_methods(false).include?(method)
-      return false
-    end
-
   end
 
 end
diff --git a/test/acceptance/stub_instance_method_defined_on_kernel_module_test.rb b/test/acceptance/stub_instance_method_defined_on_kernel_module_test.rb
index 722566a00..daffe1058 100644
--- a/test/acceptance/stub_instance_method_defined_on_kernel_module_test.rb
+++ b/test/acceptance/stub_instance_method_defined_on_kernel_module_test.rb
@@ -72,4 +72,67 @@ def my_instance_method
   ensure
     Kernel.module_eval { remove_method :my_instance_method }
   end
+
+  def test_should_stub_public_module_method_and_leave_it_unchanged_after_test
+    Kernel.module_eval do
+      def my_instance_method
+        :original_return_value
+      end
+      public :my_instance_method
+    end
+    mod = Module.new
+    assert_snapshot_unchanged(mod) do
+      test_result = run_as_test do
+        mod.stubs(:my_instance_method).returns(:new_return_value)
+        assert_method_visibility mod, :my_instance_method, :public
+        assert_equal :new_return_value, mod.my_instance_method
+      end
+      assert_passed(test_result)
+    end
+    assert_equal :original_return_value, mod.my_instance_method
+  ensure
+    Kernel.module_eval { remove_method :my_instance_method }
+  end
+
+  def test_should_stub_protected_module_method_and_leave_it_unchanged_after_test
+    Kernel.module_eval do
+      def my_instance_method
+        :original_return_value
+      end
+      protected :my_instance_method
+    end
+    mod = Module.new
+    assert_snapshot_unchanged(mod) do
+      test_result = run_as_test do
+        mod.stubs(:my_instance_method).returns(:new_return_value)
+        assert_method_visibility mod, :my_instance_method, :protected
+        assert_equal :new_return_value, mod.send(:my_instance_method)
+      end
+      assert_passed(test_result)
+    end
+    assert_equal :original_return_value, mod.send(:my_instance_method)
+  ensure
+    Kernel.module_eval { remove_method :my_instance_method }
+  end
+
+  def test_should_stub_private_module_method_and_leave_it_unchanged_after_test
+    Kernel.module_eval do
+      def my_instance_method
+        :original_return_value
+      end
+      private :my_instance_method
+    end
+    mod = Module.new
+    assert_snapshot_unchanged(mod) do
+      test_result = run_as_test do
+        mod.stubs(:my_instance_method).returns(:new_return_value)
+        assert_method_visibility mod, :my_instance_method, :private
+        assert_equal :new_return_value, mod.send(:my_instance_method)
+      end
+      assert_passed(test_result)
+    end
+    assert_equal :original_return_value, mod.send(:my_instance_method)
+  ensure
+    Kernel.module_eval { remove_method :my_instance_method }
+  end
 end