diff --git a/htdocs/install/mysql/tables/llx_societe_rib.key.sql b/htdocs/install/mysql/tables/llx_societe_rib.key.sql
index 0fccde0395c..23be102c418 100644
--- a/htdocs/install/mysql/tables/llx_societe_rib.key.sql
+++ b/htdocs/install/mysql/tables/llx_societe_rib.key.sql
@@ -18,3 +18,5 @@
 
 
 ALTER TABLE llx_societe_rib ADD UNIQUE INDEX uk_societe_rib(label, fk_soc);
+
+ALTER TABLE llx_societe_rib ADD CONSTRAINT llx_societe_rib_fk_societe FOREIGN KEY (fk_soc) REFERENCES llx_societe(rowid);