diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index c459846264..507f345ef5 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -1,3 +1,5 @@
+require "active_support/core_ext/module/delegation"
+require "active_support/core_ext/class/attribute_accessors"
 require "active_support/core_ext/array/wrap"
 
 module ActiveRecord