diff --git a/htdocs/install/mysql/tables/llx_accounting_account.key.sql b/htdocs/install/mysql/tables/llx_accounting_account.key.sql
index 7a38b7dd01377daf7c29ab2abc53a795371e3aa0..db08831570d10e31df391e593db19cb73ef62c9d 100644
--- a/htdocs/install/mysql/tables/llx_accounting_account.key.sql
+++ b/htdocs/install/mysql/tables/llx_accounting_account.key.sql
@@ -19,6 +19,7 @@
 
 
 ALTER TABLE llx_accounting_account ADD INDEX idx_accounting_account_fk_pcg_version (fk_pcg_version);
+ALTER TABLE llx_accounting_account ADD INDEX idx_accounting_account_account_number (account_number);
 
 ALTER TABLE llx_accounting_account ADD CONSTRAINT fk_accounting_account_fk_pcg_version  FOREIGN KEY (fk_pcg_version)    REFERENCES llx_accounting_system (pcg_version);