diff --git a/htdocs/contrat/class/contrat.class.php b/htdocs/contrat/class/contrat.class.php
index d21b383bf97..3a20e2f9c6b 100644
--- a/htdocs/contrat/class/contrat.class.php
+++ b/htdocs/contrat/class/contrat.class.php
@@ -1647,7 +1647,7 @@ class Contrat extends CommonObject
 		// if buy price not defined, define buyprice as configured in margin admin
 		if ($this->pa_ht == 0)
 		{
-			if (($result = $this->defineBuyPrice($pu_ht, $remise_percent)) < 0)
+			if (($result = $this->defineBuyPrice($pu, $remise_percent)) < 0)
 			{
 				return $result;
 			}