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-rw-r--r--activeresource/lib/active_resource/base.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activeresource/lib/active_resource/base.rb b/activeresource/lib/active_resource/base.rb
index 67296a171a..5cfe4f7c7d 100644
--- a/activeresource/lib/active_resource/base.rb
+++ b/activeresource/lib/active_resource/base.rb
@@ -9,6 +9,7 @@ require 'active_support/core_ext/module/aliasing'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/object/misc'
require 'active_support/core_ext/object/to_query'
+require 'active_support/core_ext/object/duplicable'
require 'set'
require 'uri'