diff --git a/htdocs/install/mysql/migration/repair.sql b/htdocs/install/mysql/migration/repair.sql
index 22409441eac..6a2fe099fdd 100755
--- a/htdocs/install/mysql/migration/repair.sql
+++ b/htdocs/install/mysql/migration/repair.sql
@@ -376,6 +376,16 @@ update llx_bank_url as bu set url_id = (select e.fk_user_author from tmp_bank_ur
 drop table tmp_bank_url_expense_user;
 
 
+-- Delete duplicate accounting account, but only if not used
+DROP TABLE tmp_llx_accouting_account;
+CREATE TABLE tmp_llx_accouting_account AS SELECT MIN(rowid) as MINID, account_number, entity, fk_pcg_version, count(*) AS NB FROM llx_accounting_account group BY account_number, entity, fk_pcg_version HAVING count(*) >= 2 order by account_number, entity, fk_pcg_version;
+--SELECT * from tmp_llx_accouting_account;
+DELETE from llx_accounting_account where rowid in (select minid from tmp_llx_accouting_account where minid NOT IN (SELECT fk_code_ventilation from llx_facturedet) AND minid NOT IN (SELECT fk_code_ventilation from llx_facture_fourn_det) AND minid NOT IN (SELECT fk_code_ventilation from llx_expensereport_det))
+
+ALTER TABLE llx_accounting_account DROP INDEX uk_accounting_account;
+ALTER TABLE llx_accounting_account ADD UNIQUE INDEX uk_accounting_account (account_number, entity, fk_pcg_version);
+
+
 -- VMYSQL4.1 update llx_projet_task_time set task_datehour = task_date where task_datehour < task_date or task_datehour > DATE_ADD(task_date, interval 1 day);