diff --git a/htdocs/categories/edit.php b/htdocs/categories/edit.php
index a85c320a992..9416ddae748 100644
--- a/htdocs/categories/edit.php
+++ b/htdocs/categories/edit.php
@@ -81,6 +81,7 @@ if ($cancel)
 // Action mise a jour d'une categorie
 if ($action == 'update' && $user->rights->categorie->creer)
 {
+    $object->oldcopy = dol_clone($object);
 	$object->label          = $label;
 	$object->description    = dol_htmlcleanlastbr($description);
 	$object->color          = $color;