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-rw-r--r--actionpack/lib/action_dispatch/http/filter_parameters.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/http/filter_parameters.rb b/actionpack/lib/action_dispatch/http/filter_parameters.rb
index e42b4d09b0..152aaa2e67 100644
--- a/actionpack/lib/action_dispatch/http/filter_parameters.rb
+++ b/actionpack/lib/action_dispatch/http/filter_parameters.rb
@@ -1,5 +1,6 @@
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/hash/keys'
+require 'active_support/core_ext/object/duplicable'
module ActionDispatch
module Http