1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index 0a3c7c6a60..634d4a181a 100755
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -1398,7 +1398,7 @@ module ActiveRecord
                 primary_key = reflection.source_reflection.primary_key_name
                 send(through.name).select("DISTINCT #{through.quoted_table_name}.#{primary_key}").map!(&:"#{primary_key}")
               else
-                send(reflection.name).select("#{reflection.quoted_table_name}.#{reflection.klass.primary_key}").map!(&:id)
+                send(reflection.name).select("#{reflection.quoted_table_name}.#{reflection.klass.primary_key}").except(:includes).map!(&:id)
               end
             end
           end