diff --git a/activerecord/lib/active_record/associations/association_proxy.rb b/activerecord/lib/active_record/associations/association_proxy.rb
index 8e16246e80..84f868ec43 100644
--- a/activerecord/lib/active_record/associations/association_proxy.rb
+++ b/activerecord/lib/active_record/associations/association_proxy.rb
@@ -188,6 +188,9 @@ module ActiveRecord
           if select = select_value
             scope = scope.select(select)
           end
+          if Relation === scope
+            scope = scope.extending(*Array.wrap(@reflection.options[:extend]))
+          end
           scope.where(construct_owner_conditions)
         end
 
diff --git a/activerecord/test/cases/associations/extension_test.rb b/activerecord/test/cases/associations/extension_test.rb
index efaab8569e..e1f5b16eca 100644
--- a/activerecord/test/cases/associations/extension_test.rb
+++ b/activerecord/test/cases/associations/extension_test.rb
@@ -29,6 +29,11 @@ class AssociationsExtensionsTest < ActiveRecord::TestCase
     assert_equal projects(:action_controller), developers(:david).projects_extended_by_name_and_block.find_most_recent
     assert_equal projects(:active_record), developers(:david).projects_extended_by_name_and_block.find_least_recent
   end
+  
+  def test_extension_with_scopes
+    assert_equal comments(:greetings), posts(:welcome).comments.offset(1).find_most_recent
+    assert_equal comments(:greetings), posts(:welcome).comments.not_again.find_most_recent
+  end
 
   def test_marshalling_extensions
     david = developers(:david)
diff --git a/activerecord/test/models/comment.rb b/activerecord/test/models/comment.rb
index a9aa0afced..ff533717cc 100644
--- a/activerecord/test/models/comment.rb
+++ b/activerecord/test/models/comment.rb
@@ -1,6 +1,7 @@
 class Comment < ActiveRecord::Base
   scope :limit_by, lambda {|l| limit(l) }
   scope :containing_the_letter_e, :conditions => "comments.body LIKE '%e%'"
+  scope :not_again, where("comments.body NOT LIKE '%again%'")
   scope :for_first_post, :conditions => { :post_id => 1 }
   scope :for_first_author,
               :joins => :post,