diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index b31607c1d60..4427ac9261a 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -5268,8 +5268,9 @@ class Form
 			$disabled = false; $title = '';
 			if (is_object($societe_vendeuse) && $societe_vendeuse->id == $mysoc->id && $societe_vendeuse->tva_assuj == "0")
 			{
-				// Override/enable VAT for expense report regardless of global setting - needed if expense report used for business expenses
-				if (empty($conf->global->OVERRIDE_VAT_FOR_EXPENSE_REPORT))
+				// Override/enable VAT for expense report regardless of global setting - needed if expense report used for business expenses instead
+				// of using supplier invoices (this is a very bad idea !)
+				if (empty($conf->global->EXPENSEREPORT_OVERRIDE_VAT))
 				{
 					$title = ' title="'.$langs->trans('VATIsNotUsed').'"';
 					$disabled = true;