diff --git a/app/models/rss_feed.rb b/app/models/rss_feed.rb
index 40172f4..2d1168d 100644
--- a/app/models/rss_feed.rb
+++ b/app/models/rss_feed.rb
@@ -19,6 +19,8 @@ class RssFeed < Article
     settings[:limit] || 10
   end
   def limit=(value)
+    #UPGRADE Leandro: I add this line to save the serialize attribute
+    self.body_will_change!
     settings[:limit] = value
   end
 
diff --git a/lib/acts_as_having_settings.rb b/lib/acts_as_having_settings.rb
index 4b421f3..46e302a 100644
--- a/lib/acts_as_having_settings.rb
+++ b/lib/acts_as_having_settings.rb
@@ -31,6 +31,10 @@ module ActsAsHavingSettings
             val.nil? ? (#{default}.is_a?(String) ? gettext(#{default}) : #{default}) : val
           end
           def #{setting}=(value)
+
+            #UPGRADE Leandro: I add this line to save the serialize attribute
+            send(self.class.settings_field.to_s + '_will_change!')
+
             send(self.class.settings_field)[:#{setting}] = self.class.acts_as_having_settings_type_cast(value, #{data_type.inspect})
           end
         CODE
diff --git a/test/unit/blog_test.rb b/test/unit/blog_test.rb
index 64cda89..07ae372 100644
--- a/test/unit/blog_test.rb
+++ b/test/unit/blog_test.rb
@@ -113,7 +113,11 @@ class BlogTest < ActiveSupport::TestCase
   should 'update external feed' do
     p = create_user('testuser').person
     blog = Blog.new(:profile => p, :name => 'Blog test')
-    blog.create_external_feed(:address => 'feed address')
+    blog.save
+    e = ExternalFeed.new(:address => 'feed address')
+    e.blog = blog
+    e.save
+    blog.reload
     blog.external_feed_builder = { :address => 'address edited' }
     blog.save!
     assert_equal 'address edited', blog.external_feed.address
--
libgit2 0.21.2