diff --git a/htdocs/core/class/html.formmargin.class.php b/htdocs/core/class/html.formmargin.class.php
index 83923ffa6c7..e571f7cc68c 100644
--- a/htdocs/core/class/html.formmargin.class.php
+++ b/htdocs/core/class/html.formmargin.class.php
@@ -98,7 +98,8 @@ 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 == $object::TYPE_SITUATION) {
+			if ($object->element == 'facture' && $object->type == $object::TYPE_SITUATION
+				|| $object->element == 'facture' && $object->type == $object::TYPE_CREDIT_NOTE && $conf->global->INVOICE_USE_SITUATION_CREDIT_NOTE && $object->situation_counter > 0) {
 				$pa = $line->qty * $pa_ht * ($line->situation_percent / 100);
 			} else {
 				$pa = $line->qty * $pa_ht;