diff --git a/activerecord/test/cases/nested_attributes_test.rb b/activerecord/test/cases/nested_attributes_test.rb
index 2202714..43d4e67 100644
--- a/activerecord/test/cases/nested_attributes_test.rb
+++ b/activerecord/test/cases/nested_attributes_test.rb
@@ -465,6 +465,13 @@ module NestedAttributesOnACollectionAssociationTests
     assert_equal 'Grace OMalley', @child_1.reload.name
   end
 
+  def test_should_not_overwrite_unsaved_updates_when_loading_association
+    @pirate.reload
+    @pirate.send(association_setter, [{ :id => @child_1.id, :name => 'Grace OMalley' }])
+    @pirate.send(@association_name).send(:load_target)
+    assert_equal 'Grace OMalley', @pirate.send(@association_name).target.find { |r| r.id == @child_1.id }.name
+  end
+
   def test_should_take_a_hash_with_composite_id_keys_and_assign_the_attributes_to_the_associated_models
     @child_1.stubs(:id).returns('ABC1X')
     @child_2.stubs(:id).returns('ABC2X')