diff --git a/inc/conditionnable.class.php b/inc/conditionnable.class.php
index 78ff73541..4c5f9e170 100644
--- a/inc/conditionnable.class.php
+++ b/inc/conditionnable.class.php
@@ -29,6 +29,10 @@
  * ---------------------------------------------------------------------
  */
 
+if (!defined('GLPI_ROOT')) {
+   die("Sorry. You can't access this file directly");
+}
+
 trait PluginFormcreatorConditionnable
 {
    public function updateConditions($input) {