diff --git a/htdocs/install/mysql/migration/3.9.0-4.0.0.sql b/htdocs/install/mysql/migration/3.9.0-4.0.0.sql
index e939563cf9b..0ddeaf8f3ad 100644
--- a/htdocs/install/mysql/migration/3.9.0-4.0.0.sql
+++ b/htdocs/install/mysql/migration/3.9.0-4.0.0.sql
@@ -136,6 +136,7 @@ CREATE TABLE llx_website
 	tms           timestamp
 ) ENGINE=innodb;
 ALTER TABLE llx_website ADD COLUMN fk_default_home integer;
+ALTER TABLE llx_website CHANGE COLUMN shortname ref varchar(24) NOT NULL;
 ALTER TABLE llx_website ADD UNIQUE INDEX uk_website_ref (ref, entity);
 
 CREATE TABLE llx_website_page