diff --git a/Gemfile b/Gemfile
index b1f7f27..78cdd51 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ case ENV["MODEL_ADAPTER"]
 when nil, "active_record"
   gem "sqlite3"
   gem "activerecord", '~> 3.0.9', :require => "active_record"
-  gem "with_model"
+  gem "with_model", '~> 0.1.5'
   gem "meta_where"
 when "data_mapper"
   gem "dm-core", "~> 1.0.2"
diff --git a/lib/cancan/controller_resource.rb b/lib/cancan/controller_resource.rb
index 1e7f273..a2463a7 100644
--- a/lib/cancan/controller_resource.rb
+++ b/lib/cancan/controller_resource.rb
@@ -141,7 +141,7 @@ module CanCan
     def resource_class
       case @options[:class]
       when false  then name.to_sym
-      when nil    then name.to_s.camelize.constantize
+      when nil    then namespaced_name.to_s.camelize.constantize
       when String then @options[:class].constantize
       else @options[:class]
       end
@@ -220,6 +220,12 @@ module CanCan
       @name || name_from_controller
     end
 
+    def namespaced_name
+      @params[:controller].sub("Controller", "").singularize.camelize.constantize
+    rescue NameError
+      name
+    end
+
     def name_from_controller
       @params[:controller].sub("Controller", "").underscore.split('/').last.singularize
     end
diff --git a/spec/cancan/controller_resource_spec.rb b/spec/cancan/controller_resource_spec.rb
index 5ce60a5..0a286b2 100644
--- a/spec/cancan/controller_resource_spec.rb
+++ b/spec/cancan/controller_resource_spec.rb
@@ -33,6 +33,18 @@ describe CanCan::ControllerResource do
     @controller.instance_variable_get(:@project).should == project
   end
 
+  it "should attempt to load a resource with the same namespace as the controller when using :: for namespace" do
+    module MyEngine
+      class Project < ::Project; end
+    end
+
+    project = MyEngine::Project.create!
+    @params.merge!(:controller => "MyEngine::ProjectsController", :action => "show", :id => project.id)
+    resource = CanCan::ControllerResource.new(@controller)
+    resource.load_resource
+    @controller.instance_variable_get(:@project).should == project
+  end
+
   it "should properly load resource for namespaced controller when using '::' for namespace" do
     project = Project.create!
     @params.merge!(:controller => "Admin::ProjectsController", :action => "show", :id => project.id)