diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index e5880a6b7b..aa09df5743 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1156,8 +1156,8 @@ class BasicsTest < ActiveRecord::TestCase
   end
 
   def test_find_keeps_multiple_group_values
-    combined = Developer.all.merge!(:group => 'developers.name, developers.salary, developers.id, developers.created_at, developers.updated_at').to_a
-    assert_equal combined, Developer.all.merge!(:group => ['developers.name', 'developers.salary', 'developers.id', 'developers.created_at', 'developers.updated_at']).to_a
+    combined = Developer.all.merge!(:group => 'developers.name, developers.salary, developers.id, developers.created_at, developers.updated_at, developers.created_on, developers.updated_on').to_a
+    assert_equal combined, Developer.all.merge!(:group => ['developers.name', 'developers.salary', 'developers.id', 'developers.created_at', 'developers.updated_at', 'developers.created_on', 'developers.updated_on']).to_a
   end
 
   def test_find_symbol_ordered_last