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-rw-r--r--activesupport/test/core_ext/module/synchronization_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/module/synchronization_test.rb b/activesupport/test/core_ext/module/synchronization_test.rb
index eb850893f0..6c407e2260 100644
--- a/activesupport/test/core_ext/module/synchronization_test.rb
+++ b/activesupport/test/core_ext/module/synchronization_test.rb
@@ -1,3 +1,4 @@
+require 'thread'
require 'abstract_unit'
require 'active_support/core_ext/class/attribute_accessors'