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-rw-r--r--actionmailer/lib/action_mailer/log_subscriber.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/log_subscriber.rb b/actionmailer/lib/action_mailer/log_subscriber.rb
index c108156792..8467d45986 100644
--- a/actionmailer/lib/action_mailer/log_subscriber.rb
+++ b/actionmailer/lib/action_mailer/log_subscriber.rb
@@ -1,3 +1,5 @@
+require 'active_support/log_subscriber'
+
module ActionMailer
# Implements the ActiveSupport::LogSubscriber for logging notifications when
# email is delivered and received.