diff --git a/lib/classes/StudipLog.class.php b/lib/classes/StudipLog.class.php
index b99b13cf1c5f4a9d0dc565d2c8024eb3e2d2b2c8..54d513dcd4969a89b27195b67f7e82e6de8c2745 100644
--- a/lib/classes/StudipLog.class.php
+++ b/lib/classes/StudipLog.class.php
@@ -161,7 +161,7 @@ class StudipLog
      * @param string $name The name of the log action.
      * @return mixed Number of deleted objects or false if action is unknown.
      */
-    public function unregisterAction($name)
+    public static function unregisterAction($name)
     {
         $action = LogAction::findOneByName($name);
         if ($action) {