1 files changed, 4 insertions, 1 deletions
diff --git a/activesupport/test/core_ext/module/synchronization_test.rb b/activesupport/test/core_ext/module/synchronization_test.rb
index c28bc9b073..43d65ab249 100644
--- a/activesupport/test/core_ext/module/synchronization_test.rb
+++ b/activesupport/test/core_ext/module/synchronization_test.rb
@@ -1,5 +1,8 @@
 require 'abstract_unit'
 
+require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/synchronization'
+
 class SynchronizationTest < Test::Unit::TestCase
   def setup
     @target = Class.new
@@ -82,4 +85,4 @@ class SynchronizationTest < Test::Unit::TestCase
     assert_nothing_raised { @target.to_s; @target.to_s }
     assert_equal 2, @target.mutex.sync_count
   end
-end
-\ No newline at end of file
+end