diff --git a/htdocs/contrat/card.php b/htdocs/contrat/card.php
index 3fe0530ec77..3c38cdf4421 100644
--- a/htdocs/contrat/card.php
+++ b/htdocs/contrat/card.php
@@ -320,7 +320,7 @@ if ($action == 'add' && $user->rights->contrat->creer)
 								}
 
 								if ($conf->global->PRODUIT_DESC_IN_FORM)
-									$desc .= ($lines[$i]->desc && $lines[$i]->desc!=$lines[$i]->libelle)?dol_htmlentitiesbr($lines[$i]->desc):'';
+									$desc = ($lines[$i]->desc && $lines[$i]->desc!=$lines[$i]->libelle)?dol_htmlentitiesbr($lines[$i]->desc):'';
 							}
 							else {
 							    $desc = dol_htmlentitiesbr($lines[$i]->desc);