diff --git a/workflow/engine/classes/class.patch.php b/workflow/engine/classes/class.patch.php
index 4a5ce313c..75b39fa10 100644
--- a/workflow/engine/classes/class.patch.php
+++ b/workflow/engine/classes/class.patch.php
@@ -12,6 +12,7 @@ G::LoadClass("TaskUser");
 abstract class patch
 {
     static protected $isPathchable = false;
+    static public $dbAdapter = 'mysql';
     abstract static public function isApplicable();
     abstract static public function execute();
 }