diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index 22010b517c060047282fca82cdc809ca544ec449..1f1749af4ec6b319cf75115243403e9aceee8f91 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -1,6 +1,7 @@
 require 'active_support/core_ext/hash/except'
 require 'active_support/core_ext/module/introspection'
 require 'active_support/core_ext/module/remove_method'
+require 'active_support/core_ext/module/delegation'
 
 module ActiveModel
   class Name