diff --git a/htdocs/categories/index.php b/htdocs/categories/index.php
index e0952249a44..88b21168e10 100644
--- a/htdocs/categories/index.php
+++ b/htdocs/categories/index.php
@@ -31,7 +31,7 @@ require("../main.inc.php");
 require_once(DOL_DOCUMENT_ROOT."/categories/class/categorie.class.php");
 require_once(DOL_DOCUMENT_ROOT."/lib/treeview.lib.php");
 
-$type=isset($_GET['type'])?$_GET['type']:isset($_POST['type'])?$_POST['type']:0;
+$type=isset($_GET['type'])?$_GET['type']:(isset($_POST['type'])?$_POST['type']:0);
 
 if (!$user->rights->categorie->lire) accessforbidden();