diff --git a/actionpack/lib/action_view/helpers/active_record_helper.rb b/actionpack/lib/action_view/helpers/active_record_helper.rb
index 541899ea6a455..7c0dfdab10730 100644
--- a/actionpack/lib/action_view/helpers/active_record_helper.rb
+++ b/actionpack/lib/action_view/helpers/active_record_helper.rb
@@ -194,7 +194,7 @@ def error_messages_for(*params)
               options[:header_message]
             else
               object_name = options[:object_name].to_s.gsub('_', ' ')
-              object_name = I18n.t(object_name, :default => object_name, :scope => [:activerecord, :models], :count => 1)
+              object_name = I18n.t(options[:object_name].to_s, :default => object_name, :scope => [:activerecord, :models], :count => 1)
               locale.t :header, :count => count, :model => object_name
             end
             message = options.include?(:message) ? options[:message] : locale.t(:body)
diff --git a/actionpack/test/template/active_record_helper_i18n_test.rb b/actionpack/test/template/active_record_helper_i18n_test.rb
index 4b6e8ddccae5b..9d04c882c8d29 100644
--- a/actionpack/test/template/active_record_helper_i18n_test.rb
+++ b/actionpack/test/template/active_record_helper_i18n_test.rb
@@ -4,9 +4,12 @@ class ActiveRecordHelperI18nTest < Test::Unit::TestCase
   include ActionView::Helpers::ActiveRecordHelper
   
   attr_reader :request
+
   def setup
     @object = stub :errors => stub(:count => 1, :full_messages => ['full_messages'])
-    @object_name = 'book'
+    @object_name = 'book_seller'
+    @object_name_without_underscore = 'book seller'
+
     stubs(:content_tag).returns 'content_tag'
 
     I18n.stubs(:t).with(:'header', :locale => 'en', :scope => [:activerecord, :errors, :template], :count => 1, :model => '').returns "1 error prohibited this  from being saved"
@@ -37,8 +40,8 @@ def test_error_messages_for_given_no_message_option_it_translates_message
   end
   
   def test_error_messages_for_given_object_name_it_translates_object_name
-    I18n.expects(:t).with(:header, :locale => 'en', :scope => [:activerecord, :errors, :template], :count => 1, :model => @object_name).returns "1 error prohibited this #{@object_name} from being saved"
-    I18n.expects(:t).with(@object_name, :default => @object_name, :count => 1, :scope => [:activerecord, :models]).once.returns @object_name
+    I18n.expects(:t).with(:header, :locale => 'en', :scope => [:activerecord, :errors, :template], :count => 1, :model => @object_name_without_underscore).returns "1 error prohibited this #{@object_name_without_underscore} from being saved"
+    I18n.expects(:t).with(@object_name, :default => @object_name_without_underscore, :count => 1, :scope => [:activerecord, :models]).once.returns @object_name_without_underscore
     error_messages_for(:object => @object, :locale => 'en', :object_name => @object_name)
   end
 end