diff --git a/modules/module/schemas/task_queue.xml b/modules/module/schemas/task_queue.xml
index 6e991a700..73e18ab33 100644
--- a/modules/module/schemas/task_queue.xml
+++ b/modules/module/schemas/task_queue.xml
@@ -3,6 +3,5 @@
 	<column name="handler" type="varchar" size="191" notnull="notnull" />
 	<column name="args" type="longtext" notnull="notnull" />
 	<column name="options" type="longtext" notnull="notnull" />
-	<column name="lock" type="int" notnull="notnull" default="0" index="idx_lock" />
 	<column name="regdate" type="datetime" notnull="notnull" default="current_timestamp()" index="idx_regdate" />
 </table>