diff --git a/htdocs/install/mysql/migration/16.0.0-17.0.0.sql b/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
index 20a9d7b097f..c0b91d5191f 100644
--- a/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
+++ b/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
@@ -57,6 +57,9 @@ UPDATE llx_c_actioncomm SET type = 'system' WHERE code = 'AC_OTH';
 
 ALTER TABLE llx_opensurvey_user_studs MODIFY reponses VARCHAR(200) NOT NULL;
 
+ALTER TABLE llx_overwrite_trans DROP INDEX uk_overwrite_trans;
+ALTER TABLE llx_overwrite_trans ADD UNIQUE INDEX uk_overwrite_trans(lang, transkey, entity);
+
 -- v17
 
 ALTER TABLE llx_mailing_cibles MODIFY COLUMN source_type varchar(32);