diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index fe8a812a8a2..a8d96ed4b34 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -5558,7 +5558,8 @@ class Form
 		if ($prefixforautocompletemode == 'societe') $prefixforautocompletemode='company';
 		$confkeyforautocompletemode=strtoupper($prefixforautocompletemode).'_USE_SEARCH_TO_SELECT';	// For example COMPANY_USE_SEARCH_TO_SELECT
 
-		$fieldstoshow='t.ref';
+		if (DOL_VERSION < 10 && $objecttmp->element == 'facture') $fieldstoshow = 't.facnumber';
+		else $fieldstoshow='t.ref';
 		if (! empty($objecttmp->fields))	// For object that declare it, it is better to use declared fields ( like societe, contact, ...)
 		{
 			$tmpfieldstoshow='';