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-rw-r--r--actionpack/lib/action_controller/metal.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal.rb b/actionpack/lib/action_controller/metal.rb
index 6aa4fe6019..e9007d3631 100644
--- a/actionpack/lib/action_controller/metal.rb
+++ b/actionpack/lib/action_controller/metal.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/class/inheritable_attributes'
+
module ActionController
# ActionController::Metal provides a way to get a valid Rack application from a controller.
#