diff --git a/newznab/controllers/Books.php b/newznab/controllers/Books.php
index ecedbb11a..69333e2a9 100644
--- a/newznab/controllers/Books.php
+++ b/newznab/controllers/Books.php
@@ -60,6 +60,12 @@ class Books
 	 */
 	public $renamed;
 
+	/**
+	 * Store names of failed Amazon lookup items
+	 * @var array
+	 */
+	public $failCache;
+
 	/**
 	 * @param array $options Class instances / Echo to cli.
 	 */
diff --git a/newznab/controllers/Konsole.php b/newznab/controllers/Konsole.php
index 6a290aa82..d9aff3477 100644
--- a/newznab/controllers/Konsole.php
+++ b/newznab/controllers/Konsole.php
@@ -56,6 +56,12 @@ class Konsole
 	 */
 	public $renamed;
 
+	/**
+	 * Store names of failed Amazon lookup items
+	 * @var array
+	 */
+	public $failCache;
+
 	/**
 	 * @param array $options Class instances / Echo to cli.
 	 */
diff --git a/newznab/controllers/Musik.php b/newznab/controllers/Musik.php
index c33c7ff8d..26805a47e 100644
--- a/newznab/controllers/Musik.php
+++ b/newznab/controllers/Musik.php
@@ -54,6 +54,12 @@ class Musik
 	 */
 	public $renamed;
 
+	/**
+	 * Store names of failed Amazon lookup items
+	 * @var array
+	 */
+	public $failCache;
+
 	/**
 	 * @param array $options Class instances/ echo to CLI.
 	 */