diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 5c8dbd1b47..d4d0220fb7 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -7,7 +7,6 @@ require 'active_support/time'
 require 'active_support/core_ext/class/attribute'
 require 'active_support/core_ext/class/attribute_accessors'
 require 'active_support/core_ext/class/delegating_attributes'
-require 'active_support/core_ext/class/attribute'
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/hash/deep_merge'
 require 'active_support/core_ext/hash/indifferent_access'