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-rw-r--r--actionmailer/lib/action_mailer/old_api.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/old_api.rb b/actionmailer/lib/action_mailer/old_api.rb
index b2111209c7..79d024a350 100644
--- a/actionmailer/lib/action_mailer/old_api.rb
+++ b/actionmailer/lib/action_mailer/old_api.rb
@@ -1,3 +1,4 @@
+require 'active_support/concern'
require 'active_support/core_ext/object/try'
require 'active_support/core_ext/object/blank'