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-rw-r--r--activesupport/lib/active_support/core_ext/module/synchronization.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/synchronization.rb b/activesupport/lib/active_support/core_ext/module/synchronization.rb
index 069db3fed0..f72d512340 100644
--- a/activesupport/lib/active_support/core_ext/module/synchronization.rb
+++ b/activesupport/lib/active_support/core_ext/module/synchronization.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/module/aliasing'
+
class Module
# Synchronize access around a method, delegating synchronization to a
# particular mutex. A mutex (either a Mutex, or any object that responds to