diff --git a/htdocs/product.class.php b/htdocs/product.class.php
index b225d57f58a..9d97e6b9d21 100644
--- a/htdocs/product.class.php
+++ b/htdocs/product.class.php
@@ -258,11 +258,16 @@ class Product
     	$sql = "SELECT COUNT(*)";
       $sql.= " FROM ".MAIN_DB_PREFIX."propaldet as p, ".MAIN_DB_PREFIX."commandedet as c";
       $sql.= ", ".MAIN_DB_PREFIX."facturedet as f, ".MAIN_DB_PREFIX."contratdet as ct";
-      $sql.= " WHERE p.fk_product = ".$id." AND c.fk_product = ".$id." AND f.fk_product = ".$id." AND ct.fkproduct = ".$id;
+      $sql.= " WHERE p.fk_product = ".$id." OR c.fk_product = ".$id." OR f.fk_product = ".$id." OR ct.fk_product = ".$id;
       $resql = $this->db->query($sql);
-      if ($resql == 0)
+      if ($resql)
       {
-      	return 0;
+        $row = $this->db->fetch_row($resql);
+        $nbuse = $row[0];
+      }
+      if ($nbuse == 0)
+      {
+        return 0;
       }
       else
       {
@@ -270,6 +275,7 @@ class Product
       }
     }
 
+
     /**
      *    \brief      Suppression du produit en base si pas utilisé
      *    \param      id          id du produit
diff --git a/htdocs/product/fiche.php b/htdocs/product/fiche.php
index 372ea3aea56..39f7e7a900e 100644
--- a/htdocs/product/fiche.php
+++ b/htdocs/product/fiche.php
@@ -745,8 +745,7 @@ if ($_GET["action"] == '')
         print '<a class="tabAction" href="fiche.php?action=clone&amp;id='.$product->id.'">'.$langs->trans("CreateCopy").'</a>';
     }
     
-    $product = new Product($db);
-    $prod_use = $product->verif_prod_use($id);
+    $prod_use = $product->verif_prod_use($product->id);
     
     if ($user->rights->produit->supprimer && $prod_use == 0)
     {