diff --git a/htdocs/core/ajax/onlineSign.php b/htdocs/core/ajax/onlineSign.php
index 5110918541f..ce9ae57864d 100644
--- a/htdocs/core/ajax/onlineSign.php
+++ b/htdocs/core/ajax/onlineSign.php
@@ -48,6 +48,10 @@ if (!defined('NOIPCHECK')) {
 if (!defined('NOBROWSERNOTIF')) {
 	define('NOBROWSERNOTIF', '1');
 }
+$entity = (!empty($_GET['entity']) ? (int) $_GET['entity'] : (!empty($_POST['entity']) ? (int) $_POST['entity'] : 1));
+if (is_numeric($entity)) {
+	define("DOLENTITY", $entity);
+}
 include '../../main.inc.php';
 
 $action = GETPOST('action', 'aZ09');
diff --git a/htdocs/public/onlinesign/newonlinesign.php b/htdocs/public/onlinesign/newonlinesign.php
index 8bd95d23c8d..d1020dc2c1d 100644
--- a/htdocs/public/onlinesign/newonlinesign.php
+++ b/htdocs/public/onlinesign/newonlinesign.php
@@ -193,7 +193,7 @@ $replacemainarea = (empty($conf->dol_hide_leftmenu) ? '<div>' : '').'<div>';
 llxHeader($head, $langs->trans("OnlineSignature"), '', '', 0, 0, '', '', '', 'onlinepaymentbody', $replacemainarea, 1);
 
 if ($action == 'refusepropal') {
-	print $form->formconfirm($_SERVER["PHP_SELF"].'?ref='.urlencode($ref).'&securekey='.urlencode($SECUREKEY), $langs->trans('RefusePropal'), $langs->trans('ConfirmRefusePropal', $object->ref), 'confirm_refusepropal', '', '', 1);
+	print $form->formconfirm($_SERVER["PHP_SELF"].'?ref='.urlencode($ref).'&securekey='.urlencode($SECUREKEY).($conf->multicompany->enabled?'&entity='.$entity:''), $langs->trans('RefusePropal'), $langs->trans('ConfirmRefusePropal', $object->ref), 'confirm_refusepropal', '', '', 1);
 }
 
 // Check link validity for param 'source' to avoid use of the examples as value
@@ -431,11 +431,12 @@ if ($action == "dosign" && empty($cancel)) {
 						"ref" : \''.dol_escape_js($REF).'\',
 						"securekey" : \''.dol_escape_js($SECUREKEY).'\',
 						"mode" : \''.dol_escape_htmltag($source).'\',
+						"entity" : \''.dol_escape_htmltag($entity).'\',
 					},
 					success: function(response) {
 						if(response == "success"){
 							console.log("Success on saving signature");
-							window.location.replace("'.$_SERVER["PHP_SELF"].'?ref='.urlencode($ref).'&message=signed&securekey='.urlencode($SECUREKEY).'");
+							window.location.replace("'.$_SERVER["PHP_SELF"].'?ref='.urlencode($ref).'&message=signed&securekey='.urlencode($SECUREKEY).($conf->multicompany->enabled?'&entity='.$entity:'').'");
 						}else{
 							console.error(response);
 						}