diff --git a/htdocs/install/mysql/tables/llx_projet_task.sql b/htdocs/install/mysql/tables/llx_projet_task.sql
index 0c91a86b1a80d3667aa95eeaedfd7d7a188083be..1b73cc7178111a0537e0f531d9eb0730d33eba39 100644
--- a/htdocs/install/mysql/tables/llx_projet_task.sql
+++ b/htdocs/install/mysql/tables/llx_projet_task.sql
@@ -20,6 +20,7 @@
 create table llx_projet_task
 (
   rowid					integer AUTO_INCREMENT PRIMARY KEY,
+  ref 					varchar(50),
   fk_projet				integer NOT NULL,
   fk_task_parent		integer DEFAULT 0 NOT NULL,
   datec					datetime,						-- date creation