diff --git a/htdocs/supplier_proposal/class/supplier_proposal.class.php b/htdocs/supplier_proposal/class/supplier_proposal.class.php
index f609befc076..ea10b4d7137 100644
--- a/htdocs/supplier_proposal/class/supplier_proposal.class.php
+++ b/htdocs/supplier_proposal/class/supplier_proposal.class.php
@@ -2998,7 +2998,8 @@ class SupplierProposalLine extends CommonObjectLine
 
 		// if buy price not defined, define buyprice as configured in margin admin
 		if ($this->pa_ht == 0) {
-			if (($result = $this->defineBuyPrice($this->subprice, $this->remise_percent, $this->fk_product)) < 0) {
+			$result = $this->defineBuyPrice($this->subprice, $this->remise_percent, $this->fk_product);
+			if ($result < 0) {
 				return $result;
 			} else {
 				$this->pa_ht = $result;