diff --git a/tests/php/ORM/DataObjectTest/Bracket.php b/tests/php/ORM/DataObjectTest/Bracket.php
index 8dc7249c2..5bc44c397 100644
--- a/tests/php/ORM/DataObjectTest/Bracket.php
+++ b/tests/php/ORM/DataObjectTest/Bracket.php
@@ -2,6 +2,7 @@
 
 namespace SilverStripe\ORM\Tests\DataObjectTest;
 
+use SilverStripe\Dev\TestOnly;
 use SilverStripe\ORM\DataObject;
 
 /**
@@ -11,7 +12,7 @@ use SilverStripe\ORM\DataObject;
  * @method Team Second()
  * @method Team Winner()
  */
-class Bracket extends DataObject
+class Bracket extends DataObject implements TestOnly
 {
     private static $table_name = 'DataObjectTest_Bracket';