diff --git a/mysql/tables/llx_document_generator.sql b/mysql/tables/llx_document_generator.sql
index 8d612cc97db..e2f72245f00 100644
--- a/mysql/tables/llx_document_generator.sql
+++ b/mysql/tables/llx_document_generator.sql
@@ -21,7 +21,7 @@
 
 create table llx_document_generator
 (
-  rowid           integer AUTO_INCREMENT PRIMARY KEY,
+  rowid           integer UNSIGNED NOT NULL PRIMARY KEY,
   name            varchar(255) NOT NULL,
   classfile       varchar(255) NOT NULL,
   class           varchar(255) NOT NULL