diff --git a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
index fd779495e3e..0a5a4a94642 100755
--- a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
+++ b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
@@ -31,3 +31,5 @@ UPDATE llx_const set value='auguria_menu.php' where value='auguria_frontoffice.p
 UPDATE llx_const set value='smartphone_menu.php' where value='smartphone_backoffice.php';
 UPDATE llx_const set value='smartphone_menu.php' where value='smartphone_frontoffice.php';
 
+ALTER TABLE llx_user add COLUMN fk_user integer;
+
diff --git a/htdocs/install/mysql/tables/llx_user.sql b/htdocs/install/mysql/tables/llx_user.sql
index bc4d75f0869..3974096085f 100644
--- a/htdocs/install/mysql/tables/llx_user.sql
+++ b/htdocs/install/mysql/tables/llx_user.sql
@@ -50,6 +50,7 @@ create table llx_user
   fk_societe        integer,
   fk_socpeople      integer,
   fk_member         integer,
+  fk_user           integer,               -- Hierarchic parent
   note              text DEFAULT NULL,
   datelastlogin     datetime,
   datepreviouslogin datetime,