diff --git a/htdocs/core/class/html.formaccounting.class.php b/htdocs/core/class/html.formaccounting.class.php
index 3437d4fa050..965c6c4f13f 100644
--- a/htdocs/core/class/html.formaccounting.class.php
+++ b/htdocs/core/class/html.formaccounting.class.php
@@ -454,6 +454,7 @@ class FormAccounting extends Form
 	public function select_auxaccount($selectid, $htmlname = 'account_num_aux', $showempty = 0, $morecss = 'minwidth100 maxwidth300 maxwidthonsmartphone', $usecache = '', $labelhtmlname = '')
 	{
 		// phpcs:enable
+		global $conf;
 
 		$aux_account = array();