diff --git a/activerecord/lib/active_record/associations/collection_association.rb b/activerecord/lib/active_record/associations/collection_association.rb
index 0cb17b47e84d0b9416f054f127f777c0c07b629c..583ee11907b96367f95f3a8273028e8ddbb22327 100644
--- a/activerecord/lib/active_record/associations/collection_association.rb
+++ b/activerecord/lib/active_record/associations/collection_association.rb
@@ -44,10 +44,7 @@ def ids_reader
         if loaded?
           target.pluck(reflection.association_primary_key)
         else
-          @association_ids ||= (
-            column = "#{reflection.quoted_table_name}.#{reflection.association_primary_key}"
-            scope.pluck(column)
-          )
+          @association_ids ||= scope.pluck(reflection.association_primary_key)
         end
       end
 
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index d7ceb6d4efd9525ac4a2b974d71fd9864fc35c3e..f534e9c00e18126730b7753efee0bf4774dd8f8a 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -107,7 +107,7 @@
     t.boolean :has_fun, null: false, default: false
   end
 
-  create_table :bulbs, force: true do |t|
+  create_table :bulbs, primary_key: "ID", force: true do |t|
     t.integer :car_id
     t.string  :name
     t.boolean :frickinawesome, default: false