diff --git a/htdocs/core/class/html.formmargin.class.php b/htdocs/core/class/html.formmargin.class.php
index da8acce83d4..72352bc5bdb 100644
--- a/htdocs/core/class/html.formmargin.class.php
+++ b/htdocs/core/class/html.formmargin.class.php
@@ -91,7 +91,7 @@ class FormMargin
 				$line->pa_ht = $line->subprice * (1 - ($line->remise_percent / 100));
 			}
 
-			$pv = $line->qty * $line->subprice * (1 - $line->remise_percent / 100);
+			$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
 			$pa = $line->qty * $pa_ht;