diff --git a/htdocs/install/mysql/migration/11.0.0-12.0.0.sql b/htdocs/install/mysql/migration/11.0.0-12.0.0.sql
index 425e47d3251..02eb3c77d4d 100644
--- a/htdocs/install/mysql/migration/11.0.0-12.0.0.sql
+++ b/htdocs/install/mysql/migration/11.0.0-12.0.0.sql
@@ -343,6 +343,7 @@ ALTER TABLE llx_commande_fournisseurdet ADD INDEX idx_commande_fournisseurdet_fk
 
 
 -- VMYSQL4.3 ALTER TABLE llx_c_shipment_mode MODIFY COLUMN tracking varchar(255) NULL;
+-- VPGSQL8.2 ALTER TABLE llx_c_shipment_mode ALTER COLUMN tracking DROP NOT NULL;
 
 INSERT INTO llx_c_shipment_mode (rowid,code,libelle,description,tracking,active) VALUES (9,'INPERSON', 'In person at your site', NULL, NULL, 0);
 INSERT INTO llx_c_shipment_mode (rowid,code,libelle,description,tracking,active) VALUES (10,'FEDEX', 'Fedex', NULL, 'https://www.fedex.com/apps/fedextrack/index.html?tracknumbers={TRACKID}', 0);