diff --git a/htdocs/install/mysql/tables/llx_facture_fourn_rec.key.sql b/htdocs/install/mysql/tables/llx_facture_fourn_rec.key.sql
index b3065fdb5d6..b82e75d85d6 100644
--- a/htdocs/install/mysql/tables/llx_facture_fourn_rec.key.sql
+++ b/htdocs/install/mysql/tables/llx_facture_fourn_rec.key.sql
@@ -16,7 +16,7 @@
 -- ============================================================================
 
 
-ALTER TABLE llx_facture_fourn_rec ADD UNIQUE INDEX uk_facture_fourn_rec_ref (ref, entity);
+ALTER TABLE llx_facture_fourn_rec ADD UNIQUE INDEX uk_facture_fourn_rec_ref (titre, entity);
 ALTER TABLE llx_facture_fourn_rec ADD UNIQUE INDEX uk_facture_fourn_rec_ref_supplier (ref_supplier, fk_soc, entity);
 
 ALTER TABLE llx_facture_fourn_rec ADD INDEX idx_facture_fourn_rec_date_lim_reglement (date_lim_reglement);