diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index ca916981076..a2044bfe4ba 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -3200,7 +3200,7 @@ if ($action == 'create')
 		print '<input type="hidden" name="origin"         value="' . $objectsrc->element . '">';
 		print '<input type="hidden" name="originid"       value="' . $objectsrc->id . '">';
 
-		switch ($classname) {
+		switch (get_class($objectsrc)) {
 			case 'Propal':
 				$newclassname = 'CommercialProposal';
 				break;