diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index 00d49dd..553ede2 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -96,6 +96,7 @@ module ActiveRecord
       became.instance_variable_set("@attributes_cache", @attributes_cache)
       became.instance_variable_set("@persisted", persisted?)
       became.instance_variable_set("@destroyed", destroyed?)
+      became.send(:ensure_proper_type)
       became
     end

diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 9f2b0c9..21ed81f 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1353,7 +1353,7 @@ class BasicsTest < ActiveRecord::TestCase

   def test_inspect_instance
     topic = topics(:first)
-    assert_equal %(#<Topic id: 1, title: "The First Topic", author_name: "David", author_email_address: "david@loudthinking.com", written_on: "#{topic.written_on.to_s(:db)}", bonus_time: "#{topic.bonus_time.to_s(:db)}", last_read: "#{topic.last_read.to_s(:db)}", content: "Have a nice day", approved: false, replies_count: 1, parent_id: nil, parent_title: nil, type: nil, group: nil, created_at: "#{topic.created_at.to_s(:db)}", updated_at: "#{topic.updated_at.to_s(:db)}">), topic.inspect
+    assert_equal %(#<Topic id: 1, title: "The First Topic", author_name: "David", author_email_address: "david@loudthinking.com", written_on: "#{topic.written_on.to_s(:db)}", bonus_time: "#{topic.bonus_time.to_s(:db)}", last_read: "#{topic.last_read.to_s(:db)}", content: "Have a nice day", approved: false, replies_count: 1, parent_id: nil, parent_title: nil, type: "Topic", group: nil, created_at: "#{topic.created_at.to_s(:db)}", updated_at: "#{topic.updated_at.to_s(:db)}">), topic.inspect
   end

   def test_inspect_new_instance
@@ -1377,11 +1377,6 @@ class BasicsTest < ActiveRecord::TestCase
     assert_equal '"The First Topic Now Has A Title With\nNewlines And M..."', t.attribute_for_inspect(:title)
   end

-  def test_becomes
-    assert_kind_of Reply, topics(:first).becomes(Reply)
-    assert_equal "The First Topic", topics(:first).becomes(Reply).title
-  end
-
   def test_silence_sets_log_level_to_error_in_block
     original_logger = ActiveRecord::Base.logger
     log = StringIO.new
diff --git a/activerecord/test/cases/persistence_test.rb b/activerecord/test/cases/persistence_test.rb
index ffe6fb9..2616cc5 100644
--- a/activerecord/test/cases/persistence_test.rb
+++ b/activerecord/test/cases/persistence_test.rb
@@ -62,6 +62,12 @@ class PersistencesTest < ActiveRecord::TestCase
     assert_equal "bulk updated!", Topic.find(2).content
   end

+  def test_becomes
+    assert_kind_of Reply, topics(:first).becomes(Reply)
+    assert_equal "The First Topic", topics(:first).becomes(Reply).title
+    assert_equal "Reply", topics(:first).becomes(Reply).type
+  end
+
   def test_increment_attribute
     assert_equal 50, accounts(:signals37).credit_limit
     accounts(:signals37).increment! :credit_limit
diff --git a/activerecord/test/fixtures/topics.yml b/activerecord/test/fixtures/topics.yml
index 93f48ae..c925ff6 100644
--- a/activerecord/test/fixtures/topics.yml
+++ b/activerecord/test/fixtures/topics.yml
@@ -9,6 +9,7 @@ first:
   content: Have a nice day
   approved: false
   replies_count: 1
+  type: Topic

 second:
   id: 2
@@ -29,6 +30,7 @@ third:
   content: I'm a troll
   approved: true
   replies_count: 1
+  type: Topic

 fourth:
   id: 4