diff --git a/lib/externallib.php b/lib/externallib.php
index 17b4a297cbec8..da78def4ec655 100644
--- a/lib/externallib.php
+++ b/lib/externallib.php
@@ -1232,12 +1232,6 @@ protected function __construct() {
         }
     }
 
-    /**
-     * Clone - private - can not be cloned
-     */
-    private final function __clone() {
-    }
-
     /**
      * Return only one instance
      *
diff --git a/lib/filestorage/file_system.php b/lib/filestorage/file_system.php
index e8a78fb816051..2339c13bd80d4 100644
--- a/lib/filestorage/file_system.php
+++ b/lib/filestorage/file_system.php
@@ -34,20 +34,6 @@
  */
 abstract class file_system {
 
-    /**
-     * Private clone method to prevent cloning of the instance.
-     */
-    final protected function __clone() {
-        return;
-    }
-
-    /**
-     * Private wakeup method to prevent unserialising of the instance.
-     */
-    final protected function __wakeup() {
-        return;
-    }
-
     /**
      * Output the content of the specified stored file.
      *