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-rw-r--r--actionpack/lib/action_controller/metal/responder.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/responder.rb b/actionpack/lib/action_controller/metal/responder.rb
index 6178a59029..0b2cee6868 100644
--- a/actionpack/lib/action_controller/metal/responder.rb
+++ b/actionpack/lib/action_controller/metal/responder.rb
@@ -1,3 +1,5 @@
+require 'active_support/json'
+
module ActionController #:nodoc:
# Responder is responsible for exposing a resource to different mime requests,
# usually depending on the HTTP verb. The responder is triggered when