diff --git a/htdocs/core/class/html.formmargin.class.php b/htdocs/core/class/html.formmargin.class.php
index 64048c5cfdc..7c169916b60 100644
--- a/htdocs/core/class/html.formmargin.class.php
+++ b/htdocs/core/class/html.formmargin.class.php
@@ -1,5 +1,5 @@
 <?php
-/* Copyright (c) 2015 Laurent Destailleur  <eldy@users.sourceforge.net>
+/* Copyright (c) 2015-2019 Laurent Destailleur  <eldy@users.sourceforge.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -100,7 +100,7 @@ class FormMargin
 
 			$pv = $line->total_ht;
 			$pa_ht = ($pv < 0 ? - $line->pa_ht : $line->pa_ht);      // We choosed to have line->pa_ht always positive in database, so we guess the correct sign
-			if ($object->element == 'facture' && $object->type == Facture::TYPE_SITUATION) {
+			if ($object->element == 'facture' && $object->type == $object::TYPE_SITUATION) {
 				$pa = $line->qty * $pa_ht * ($line->situation_percent / 100);
 			} else {
 				$pa = $line->qty * $pa_ht;