diff --git a/spec/fake_gem.rb b/spec/fake_gem.rb
index fa3a1c2..78e9991 100644
--- a/spec/fake_gem.rb
+++ b/spec/fake_gem.rb
@@ -1,4 +1,20 @@
-# Simulate a gem providing a subclass of ActiveRecord::Base before the Railtie is loaded.
+module Kaminari
+  module FakeGem
+    extend ActiveSupport::Concern
 
-class GemDefinedModel < ActiveRecord::Base
+    module ClassMethods
+      def inherited(kls)
+        super
+        def kls.fake_gem_defined_method; end
+      end
+    end
+  end
+end
+
+ActiveSupport.on_load :active_record do
+  ActiveRecord::Base.send :include, Kaminari::FakeGem
+
+  # Simulate a gem providing a subclass of ActiveRecord::Base before the Railtie is loaded.
+  class GemDefinedModel < ActiveRecord::Base
+  end
 end
diff --git a/spec/models/active_record/inherited_spec.rb b/spec/models/active_record/inherited_spec.rb
new file mode 100644
index 0000000..c1c66f9
--- /dev/null
+++ b/spec/models/active_record/inherited_spec.rb
@@ -0,0 +1,9 @@
+require 'spec_helper'
+
+if defined? ActiveRecord
+  describe Kaminari::ActiveRecordModelExtension do
+    subject { Class.new(ActiveRecord::Base) }
+    it { should respond_to :page }
+    it { should respond_to :fake_gem_defined_method }
+  end
+end