diff --git a/activerecord/test/cases/associations/has_one_through_disable_joins_associations_test.rb b/activerecord/test/cases/associations/has_one_through_disable_joins_associations_test.rb
index bf9d87b4ac..8a6db18055 100644
--- a/activerecord/test/cases/associations/has_one_through_disable_joins_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_through_disable_joins_associations_test.rb
@@ -2,6 +2,7 @@
 
 require "cases/helper"
 require "models/member"
+require "models/member_detail"
 require "models/organization"
 
 class HasOneThroughDisableJoinsAssociationsTest < ActiveRecord::TestCase