diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 44fb0865682..2a56131bdd5 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -5391,7 +5391,7 @@ class Product extends CommonObject
         $resql = $this->db->query($sql);
         if ($resql && $this->db->num_rows($resql) > 0) {
             $res = $this->db->fetch_array($resql);
-            $label = $label_type == 'short' ? $res[$label_type] : $langs->trans('unit' . $res['code']);
+            $label = ($label_type == 'short' ? $res[$label_type] : 'unit'.$res['code']);
             $this->db->free($resql);
             return $label;
         }