diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 63879259af..cb92f79e0e 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -22,6 +22,7 @@ require 'models/person'
 require 'models/edge'
 require 'models/joke'
 require 'models/bulb'
+require 'models/bird'
 require 'rexml/document'
 require 'active_support/core_ext/exception'
 require 'bcrypt'