diff --git a/lib/i18n_alchemy/proxy.rb b/lib/i18n_alchemy/proxy.rb
index 64abc1a..bf1e3c3 100644
--- a/lib/i18n_alchemy/proxy.rb
+++ b/lib/i18n_alchemy/proxy.rb
@@ -75,8 +75,8 @@ def build_methods
       end
 
       def build_associations
-        @target.class.nested_attributes_options.each_key do |association_name|
-          create_localized_association(association_name)
+        nested_attributes_options.each_key do |association_name|
+          create_localized_association(association_name, detect_parser_from_association(association_name))
         end
       end
 
@@ -86,9 +86,8 @@ def build_attribute(name, parser)
         define_localized_methods(name)
       end
 
-      def create_localized_association(association_name)
-        @localized_associations <<
-          AssociationParser.new(@target.class, association_name)
+      def create_localized_association(association_name, parser)
+        @localized_associations << parser.new(target_class, association_name)
       end
 
       def create_localized_attribute(column_name, parser)
@@ -120,6 +119,10 @@ def detect_parser_from_column(column)
         detect_parser(column.number? ? :number : column.type)
       end
 
+      def detect_parser_from_association(association_name)
+        detect_parser(localized_methods[association_name] ? localized_methods[association_name] : :association)
+      end
+
       def detect_parser(type_or_parser)
         case type_or_parser
         when :number
@@ -128,6 +131,8 @@ def detect_parser(type_or_parser)
           DateParser
         when :datetime, :timestamp
           TimeParser
+        when :association
+          AssociationParser
         when ::Module
           type_or_parser
         end
@@ -141,6 +146,10 @@ def columns
         target_class.columns
       end
 
+      def nested_attributes_options
+        target_class.nested_attributes_options
+      end
+
       def target_class
         @target.class
       end
diff --git a/test/custom_parsers/my_custom_association_parser.rb b/test/custom_parsers/my_custom_association_parser.rb
new file mode 100644
index 0000000..9b278c6
--- /dev/null
+++ b/test/custom_parsers/my_custom_association_parser.rb
@@ -0,0 +1,13 @@
+class MyCustomAssociationParser < I18n::Alchemy::AssociationParser
+  def parse(attributes)
+    if association.options[:polymorphic]
+      @proxy = target_class.i18n_alchemy_proxy.localized
+    end
+
+    super
+  end
+
+  def self.localize(object)
+    object
+  end
+end
diff --git a/test/db/test_schema.rb b/test/db/test_schema.rb
index 5fb6583..c57bbd3 100644
--- a/test/db/test_schema.rb
+++ b/test/db/test_schema.rb
@@ -27,4 +27,14 @@
     t.string     :account_number
     t.decimal    :total_money
   end
+
+  create_table :people do |t|
+    t.string :name
+    t.integer :personable_id
+    t.string :personable_type
+  end
+
+  create_table :companies do |t|
+    t.string :register
+  end
 end
diff --git a/test/i18n_alchemy/proxy/attributes_parsing_test.rb b/test/i18n_alchemy/proxy/attributes_parsing_test.rb
index 2fd773f..3ed9077 100644
--- a/test/i18n_alchemy/proxy/attributes_parsing_test.rb
+++ b/test/i18n_alchemy/proxy/attributes_parsing_test.rb
@@ -29,6 +29,8 @@ def test_assign_attributes
   end
 
   def test_mass_assigning_invalid_attribute
+    @person = Person.new
+    @person_localized = @person.localized
     assert_raises(ActiveRecord::UnknownAttributeError) do
       @localized.assign_attributes('i_dont_even_exist' => 40)
     end
@@ -128,6 +130,12 @@ def test_attributes_assignment_for_nested
     assert_equal '88,12', @supplier_localized.account.localized.total_money
   end
 
+  def test_should_assign_for_nested_attributes_for_polymorphic_association
+    @person_localized.assign_attributes(:personable_type => "Company", :personable_attributes => {:register => 10})
+    company = @person_localized.personable
+    assert_equal 10, company.register
+  end
+
   private
 
   def attributes_hash
diff --git a/test/models/company.rb b/test/models/company.rb
new file mode 100644
index 0000000..10a4e41
--- /dev/null
+++ b/test/models/company.rb
@@ -0,0 +1,3 @@
+class Company < ActiveRecord::Base
+  include I18n::Alchemy
+end
diff --git a/test/models/person.rb b/test/models/person.rb
new file mode 100644
index 0000000..4df4cb6
--- /dev/null
+++ b/test/models/person.rb
@@ -0,0 +1,16 @@
+class Person < ActiveRecord::Base
+  include I18n::Alchemy
+  localize :personable, :using => MyCustomAssociationParser
+
+  belongs_to :personable, :polymorphic => true
+
+  accepts_nested_attributes_for :personable
+
+  def build_personable(attributes, options = {})
+    self.personable = personable_type.constantize.new(attributes, options)
+  end
+
+  def self.i18n_alchemy_proxy
+    Company.new
+  end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index fd7cd8e..5c72e93 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -36,6 +36,8 @@ def setup
       @supplier_localized = @supplier.localized
       @user = User.new
       @user_localized = @user.localized
+      @person = Person.new
+      @person_localized = @person.localized
 
       I18n.locale = :pt
     end