diff --git a/htdocs/core/class/html.formaccounting.class.php b/htdocs/core/class/html.formaccounting.class.php
index d12c5e5eb99..47dab9f6fda 100644
--- a/htdocs/core/class/html.formaccounting.class.php
+++ b/htdocs/core/class/html.formaccounting.class.php
@@ -451,7 +451,7 @@ class FormAccounting extends Form
 	 * @param string		$labelhtmlname	HTML name of label for autofill of account from name.
 	 * @return string       	   			String with HTML select
 	 */
-	public function select_auxaccount($selectid, $htmlname = 'account_num_aux', $showempty = 0, $morecss = 'maxwidth250', $usecache = '', $labelhtmlname = '')
+	public function select_auxaccount($selectid, $htmlname = 'account_num_aux', $showempty = 0, $morecss = 'minwidth100 maxwidth300 maxwidthonsmartphone', $usecache = '', $labelhtmlname = '')
 	{
 		// phpcs:enable