diff --git a/htdocs/contrat/card.php b/htdocs/contrat/card.php
index 35338f41903..0bf304b96a1 100644
--- a/htdocs/contrat/card.php
+++ b/htdocs/contrat/card.php
@@ -433,7 +433,7 @@ if (empty($reshook))
 		}
 
 		$qty = GETPOST('qty'.$predef);
-		$remise_percent = (GETPOST('remise_percent'.$predef) != '' ? GETPOST('remise_percent'.$predef) : 0);
+		$remise_percent = ((GETPOST('remise_percent'.$predef) != '') ? GETPOST('remise_percent'.$predef) : 0);
 
 		if ($qty == '')
 		{