diff --git a/classes/log/moveback.php b/classes/log/moveback.php
index 03063719..047315cf 100644
--- a/classes/log/moveback.php
+++ b/classes/log/moveback.php
@@ -57,6 +57,13 @@ class moveback {
      */
     protected $table = '';
 
+    /**
+     * Import type
+     *
+     * @var int
+     */
+    protected $type = XAPI_IMPORT_TYPE_FAILED;
+
     /**
      * A list containing the constructed sql fragment.
      *