diff --git a/src/wp-admin/includes/class-wp-media-list-table.php b/src/wp-admin/includes/class-wp-media-list-table.php
index e8885d2421..1d1ebb0faa 100644
--- a/src/wp-admin/includes/class-wp-media-list-table.php
+++ b/src/wp-admin/includes/class-wp-media-list-table.php
@@ -9,6 +9,10 @@
  */
 class WP_Media_List_Table extends WP_List_Table {
 
+	private $detached;
+
+	private $is_trash;
+
 	/**
 	 * Constructor.
 	 *