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 0a5a4a94642..6f09732d0dc 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
@@ -33,3 +33,6 @@ UPDATE llx_const set value='smartphone_menu.php' where value='smartphone_frontof
 
 ALTER TABLE llx_user add COLUMN fk_user integer;
 
+-- margin on contracts
+alter table llx_contratdet add column fk_product_fournisseur_price int(11) after info_bits;
+alter table llx_contratdet add column buy_price_ht double(24,8) DEFAULT 0 after fk_product_fournisseur_price;
\ No newline at end of file