diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 122ba41fcd8..d69366bcb36 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -3678,7 +3678,8 @@ function img_picto($titlealt, $picto, $moreatt = '', $pictoisfullpath = false, $
 				'shapes', 'square', 'stop-circle', 'supplier', 'supplier_proposal', 'supplier_order', 'supplier_invoice',
 				'timespent', 'title_setup', 'title_accountancy', 'title_bank', 'title_hrm', 'title_agenda',
 				'uncheck', 'user-cog', 'user-injured', 'user-md', 'vat', 'website', 'workstation',
-				'conferenceorbooth', 'eventorganization'
+				'conferenceorbooth', 'eventorganization',
+				'stamp', 'signature'
 			))) {
 			$fakey = $pictowithouttext;
 			$facolor = '';