diff --git a/activerecord/lib/active_record/associations/has_one_association.rb b/activerecord/lib/active_record/associations/has_one_association.rb
index 1464227bb050f..b92cbbdeab561 100644
--- a/activerecord/lib/active_record/associations/has_one_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_association.rb
@@ -88,7 +88,7 @@ def construct_sql
             when @reflection.options[:as]
               @finder_sql = 
                 "#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_id = #{owner_quoted_id} AND " +
-                "#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.name.to_s)}"
+                "#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.base_class.name.to_s)}"
             else
               @finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}"
           end
diff --git a/activerecord/test/cases/associations/has_one_associations_test.rb b/activerecord/test/cases/associations/has_one_associations_test.rb
index 3984945f9f4a6..1ddb3f49bfe61 100644
--- a/activerecord/test/cases/associations/has_one_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_associations_test.rb
@@ -2,11 +2,9 @@
 require 'models/developer'
 require 'models/project'
 require 'models/company'
-require 'models/sponsor'
-require 'models/organization'
 
 class HasOneAssociationsTest < ActiveRecord::TestCase
-  fixtures :accounts, :companies, :developers, :projects, :developers_projects, :organizations, :sponsors
+  fixtures :accounts, :companies, :developers, :projects, :developers_projects
 
   def setup
     Account.destroyed_account_ids.clear
@@ -308,9 +306,4 @@ def test_save_of_record_with_loaded_has_one
       Firm.find(@firm.id, :include => :account).save!
     end
   end
-
-  def test_polymorphic_sti
-    assert_equal organizations(:sponsorable), sponsors(:org_sponsor).sponsorable
-    assert_equal sponsors(:org_sponsor),      organizations(:sponsorable).sponsor
-  end
 end
diff --git a/activerecord/test/fixtures/organizations.yml b/activerecord/test/fixtures/organizations.yml
index 05d620fbc60ee..25295bff87738 100644
--- a/activerecord/test/fixtures/organizations.yml
+++ b/activerecord/test/fixtures/organizations.yml
@@ -2,6 +2,4 @@ nsa:
   name: No Such Agency
 discordians:
   name: Discordians
-sponsorable:
-  name: We Need Money
-  type: SponsorableOrganization
+
diff --git a/activerecord/test/fixtures/sponsors.yml b/activerecord/test/fixtures/sponsors.yml
index 97a778404748c..42df8957d1623 100644
--- a/activerecord/test/fixtures/sponsors.yml
+++ b/activerecord/test/fixtures/sponsors.yml
@@ -6,6 +6,4 @@ boring_club_sponsor_for_groucho:
   sponsorable: some_other_guy (Member)
 crazy_club_sponsor_for_groucho:
   sponsor_club: crazy_club
-  sponsorable: some_other_guy (Member)
-org_sponsor:
-  sponsorable: sponsorable (SponsorableOrganization)
\ No newline at end of file
+  sponsorable: some_other_guy (Member)
\ No newline at end of file
diff --git a/activerecord/test/models/organization.rb b/activerecord/test/models/organization.rb
index 5d1308354daa8..d79d5037c8053 100644
--- a/activerecord/test/models/organization.rb
+++ b/activerecord/test/models/organization.rb
@@ -1,8 +1,4 @@
 class Organization < ActiveRecord::Base
   has_many :member_details
   has_many :members, :through => :member_details
-end
-
-class SponsorableOrganization < Organization
-  has_one  :sponsor, :as => :sponsorable
 end
\ No newline at end of file
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 6918a4fcab0e0..98e6d192a5303 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -283,7 +283,6 @@ def create_table(*args, &block)
 
   create_table :organizations, :force => true do |t|
     t.string :name
-    t.string :type
   end
 
   create_table :owners, :primary_key => :owner_id ,:force => true do |t|
@@ -389,7 +388,7 @@ def create_table(*args, &block)
   create_table :sponsors, :force => true do |t|
     t.integer :club_id
     t.integer :sponsorable_id
-    t.string  :sponsorable_type
+    t.string :sponsorable_type
   end
 
   create_table :subscribers, :force => true, :id => false do |t|