diff --git a/htdocs/install/mysql/migration/19.0.0-20.0.0.sql b/htdocs/install/mysql/migration/19.0.0-20.0.0.sql
index f33db05e89d..8a4d585fba5 100644
--- a/htdocs/install/mysql/migration/19.0.0-20.0.0.sql
+++ b/htdocs/install/mysql/migration/19.0.0-20.0.0.sql
@@ -321,6 +321,7 @@ ALTER TABLE llx_rights_def ADD COLUMN enabled text NULL AFTER bydefault;
 DELETE FROM llx_c_action_trigger WHERE code = 'BILLREC_AUTOCREATEBILL';
 
 
+-- VMYSQL4.3 ALTER TABLE llx_element_contact DROP FOREIGN KEY idx_element_contact_fk_c_type_contact;
 -- VMYSQL4.3 ALTER TABLE llx_element_contact DROP FOREIGN KEY fk_element_contact_fk_c_type_contact;
 -- VMYSQL4.3 ALTER TABLE llx_societe_contacts DROP FOREIGN KEY fk_societe_contacts_fk_c_type_contact;
 -- VMYSQL4.3 ALTER TABLE llx_c_type_contact CHANGE COLUMN rowid rowid INTEGER NOT NULL AUTO_INCREMENT;