diff --git a/mysql/tables/llx_user_rights.sql b/mysql/tables/llx_user_rights.sql
index 1a852e78acb..acd77811c85 100644
--- a/mysql/tables/llx_user_rights.sql
+++ b/mysql/tables/llx_user_rights.sql
@@ -22,6 +22,7 @@
 
 create table llx_user_rights
 (
+  rowid         integer AUTO_INCREMENT PRIMARY KEY,
   fk_user       integer NOT NULL,
   fk_id         integer NOT NULL,