1 files changed, 5 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/associations/preloader/association.rb b/activerecord/lib/active_record/associations/preloader/association.rb
index 1e2d6c4f1e..8101c5604b 100644
--- a/activerecord/lib/active_record/associations/preloader/association.rb
+++ b/activerecord/lib/active_record/associations/preloader/association.rb
@@ -22,16 +22,16 @@ module ActiveRecord
           end
         end
 
-        # The name of the key on the associated records
-        def association_key_name
-          raise NotImplementedError
-        end
-
         private
           def options
             reflection.options
           end
 
+          # The name of the key on the associated records
+          def association_key_name
+            reflection.join_primary_key(klass)
+          end
+
           # The name of the key on the model which declares the association
           def owner_key_name
             reflection.join_foreign_key