diff --git a/phpBB/includes/nestedset/base.php b/phpBB/includes/nestedset/base.php
index 7c1e7f631e..d16e33a6db 100644
--- a/phpBB/includes/nestedset/base.php
+++ b/phpBB/includes/nestedset/base.php
@@ -23,9 +23,6 @@ abstract class phpbb_nestedset_base implements phpbb_nestedset_interface
 	/** @var String */
 	protected $table_name;
 
-	/** @var String */
-	protected $item_class = 'phpbb_nestedset_item_base';
-
 	/**
 	* Column names in the table
 	* @var String
diff --git a/phpBB/includes/nestedset/forum.php b/phpBB/includes/nestedset/forum.php
index 18936c1c55..e723e3bf18 100644
--- a/phpBB/includes/nestedset/forum.php
+++ b/phpBB/includes/nestedset/forum.php
@@ -26,9 +26,6 @@ class phpbb_nestedset_forum extends phpbb_nestedset_base
 	/** @var String */
 	protected $table_name;
 
-	/** @var String */
-	protected $item_class = 'phpbb_nestedset_item_forum';
-
 	/**
 	* Column names in the table
 	* @var String