diff --git a/phpBB/phpbb/install/helper/iohandler/iohandler_base.php b/phpBB/phpbb/install/helper/iohandler/iohandler_base.php
index fed4bc101f..1797a6c9ad 100644
--- a/phpBB/phpbb/install/helper/iohandler/iohandler_base.php
+++ b/phpBB/phpbb/install/helper/iohandler/iohandler_base.php
@@ -70,6 +70,11 @@ abstract class iohandler_base implements iohandler_interface
 	 */
 	protected $current_task_name;
 
+	/**
+	 * @var bool
+	 */
+	protected $restart_progress_bar;
+
 	/**
 	 * Constructor
 	 */