diff --git a/lib/pundit.rb b/lib/pundit.rb
index 610419f..865bc0f 100644
--- a/lib/pundit.rb
+++ b/lib/pundit.rb
@@ -139,8 +139,15 @@ module Pundit
     policies[record] ||= Pundit.policy!(pundit_user, record)
   end
 
-  def permitted_attributes(record)
-    name = record.class.to_s.demodulize.underscore
+  def permitted_attributes(record, options={})
+    name = options.delete(:param_key)
+    name ||= if record.class.respond_to?(:model_name) # ActiveModel and ActiveRecord
+               record.class.model_name.param_key
+             elsif record.respond_to?(:model_name)
+               record.model_name.param_key
+             else
+               record.class.to_s.demodulize.underscore
+             end
     params.require(name).permit(policy(record).permitted_attributes)
   end
 
diff --git a/spec/pundit_spec.rb b/spec/pundit_spec.rb
index 7de6fbf..c48e005 100644
--- a/spec/pundit_spec.rb
+++ b/spec/pundit_spec.rb
@@ -3,6 +3,7 @@ require "spec_helper"
 describe Pundit do
   let(:user) { double }
   let(:post) { Post.new(user) }
+  let(:customer_post) { Customer::Post.new(user) }
   let(:comment) { Comment.new }
   let(:article) { Article.new }
   let(:controller) { Controller.new(user, { :action => 'update' }) }
@@ -343,6 +344,20 @@ describe Pundit do
       expect(Controller.new(user, params).permitted_attributes(post)).to eq({ 'title' => 'Hello', 'votes' => 5 })
       expect(Controller.new(double, params).permitted_attributes(post)).to eq({ 'votes' => 5 })
     end
+
+    it "checks policy for permitted attributes for record of a ActiveModel type" do
+      params = ActionController::Parameters.new({ action: 'update', customer_post: { title: 'Hello', votes: 5, admin: true } })
+
+      expect(Controller.new(user, params).permitted_attributes(customer_post)).to eq({ 'title' => 'Hello', 'votes' => 5 })
+      expect(Controller.new(double, params).permitted_attributes(customer_post)).to eq({ 'votes' => 5 })
+    end
+
+    it "checks policy for permitted attributes for record with manually specified param key" do
+      params = ActionController::Parameters.new({ action: 'update', custom_post: { title: 'Hello', votes: 5, admin: true } })
+
+      expect(Controller.new(user, params).permitted_attributes(post, param_key: 'custom_post')).to eq({ 'title' => 'Hello', 'votes' => 5 })
+      expect(Controller.new(double, params).permitted_attributes(post, param_key: 'custom_post')).to eq({ 'votes' => 5 })
+    end
   end
 
   describe "Pundit::NotAuthorizedError" do
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index cdbf0dd..d5be5ae 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -56,6 +56,16 @@ class Post < Struct.new(:user)
   def inspect; "#<Post>"; end
 end
 
+module Customer
+  class Post < Post
+    def self.model_name
+      OpenStruct.new(param_key: 'customer_post')
+    end
+    def policy_class
+      PostPolicy
+    end
+  end
+end
 class CommentPolicy < Struct.new(:user, :comment); end
 class CommentPolicy::Scope < Struct.new(:user, :scope)
   def resolve