diff --git a/htdocs/societe/class/societe.class.php b/htdocs/societe/class/societe.class.php
index 5e532c87dd7..f312bafe9d9 100644
--- a/htdocs/societe/class/societe.class.php
+++ b/htdocs/societe/class/societe.class.php
@@ -725,7 +725,7 @@ class Societe extends CommonObject
         }
 
         // Use first price level if level not defined for third party
-        if ($conf->global->PRODUIT_MULTIPRICES && empty($this->price_level)) $this->price_level=1;
+        if (! empty($conf->global->PRODUIT_MULTIPRICES) && empty($this->price_level)) $this->price_level=1;
 
         return $result;
     }