diff --git a/htdocs/install/mysql/migration/8.0.0-9.0.0.sql b/htdocs/install/mysql/migration/8.0.0-9.0.0.sql
index 0987317b75e..5417f279144 100644
--- a/htdocs/install/mysql/migration/8.0.0-9.0.0.sql
+++ b/htdocs/install/mysql/migration/8.0.0-9.0.0.sql
@@ -29,6 +29,8 @@
 
 
 -- Missing in 8.0
+ALTER TABLE llx_contrat_extrafields ADD INDEX idx_contrat_extrafields (fk_object);
+
 ALTER TABLE llx_accounting_account DROP FOREIGN KEY fk_accounting_account_fk_pcg_version;
 ALTER TABLE llx_accounting_account MODIFY COLUMN fk_pcg_version varchar(32) NOT NULL;
 ALTER TABLE llx_accounting_system MODIFY COLUMN pcg_version varchar(32) NOT NULL;