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-rw-r--r--activesupport/lib/active_support/notifications/instrumenter.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/notifications/instrumenter.rb b/activesupport/lib/active_support/notifications/instrumenter.rb
index 7dfea4bb4b..78d0397f1f 100644
--- a/activesupport/lib/active_support/notifications/instrumenter.rb
+++ b/activesupport/lib/active_support/notifications/instrumenter.rb
@@ -1,3 +1,5 @@
+require 'securerandom'
+
module ActiveSupport
module Notifications
# Instrumentors are stored in a thread local.