diff --git a/htdocs/propal.class.php b/htdocs/propal.class.php
index 0941c1939e1..14bb5d968b3 100644
--- a/htdocs/propal.class.php
+++ b/htdocs/propal.class.php
@@ -386,7 +386,7 @@ class Propal
         $sql.= "'".addslashes($this->note)."',";
         $sql.= "'".addslashes($this->note_public)."',";
         $sql.= "'$this->modelpdf',".$this->db->idate($this->fin_validite).",";
-        $sql.= " $this->cond_reglement_id, $this->mode_reglement_id, '$this-> date_livraison')";
+        $sql.= " $this->cond_reglement_id, $this->mode_reglement_id, ".$this->db->idate($this->date_livraison).")";
 
         $resql=$this->db->query($sql);
         if ($resql)