diff --git a/module/dialog-item-achat.js b/module/dialog-item-achat.js
index b6b3f6ba..ddf4d78f 100644
--- a/module/dialog-item-achat.js
+++ b/module/dialog-item-achat.js
@@ -55,7 +55,7 @@ export class DialogItemAchat extends Dialog {
 
   static prepareVenteData(buttonAcheter, vendeurId, vendeur, acheteur) {
     const jsondata = buttonAcheter.attributes['data-jsondata']?.value;
-    const prixLot = buttonAcheter.attributes['data-prixLot']?.value ?? 0;
+    const prixLot = parseInt(buttonAcheter.attributes['data-prixLot']?.value ?? 0);
     let venteData = {
       item: JSON.parse(jsondata),
       vendeurId: vendeurId,