diff --git a/inc/ruletest.class.php b/inc/ruletest.class.php
index dd66898..2bd6080 100644
--- a/inc/ruletest.class.php
+++ b/inc/ruletest.class.php
@@ -46,7 +46,7 @@ if (!defined('GLPI_ROOT')) {
 class PluginExampleRuleTest extends Rule {
 
    // From Rule
-   public $right     = 'rule_ocs';
+   static public $right     = 'rule_ocs';
    public $can_sort  = true;
 
 
diff --git a/inc/ruletestcollection.class.php b/inc/ruletestcollection.class.php
index b5718cc..14ed461 100644
--- a/inc/ruletestcollection.class.php
+++ b/inc/ruletestcollection.class.php
@@ -40,7 +40,7 @@ class PluginExampleRuleTestCollection extends RuleCollection {
 
    // From RuleCollection
    public $stop_on_first_match = true;
-   public $right               = 'rule_ocs';
+   static public $right               = 'rule_ocs';
    public $menu_option         = 'test';
 
    function getTitle() {