diff --git a/api/fedora_item.inc b/api/fedora_item.inc
index 4d309ba8..2a70010a 100644
--- a/api/fedora_item.inc
+++ b/api/fedora_item.inc
@@ -62,7 +62,7 @@ class Fedora_Item {
    * Removes this object from the static list of $instantiated_pids
    */
   function forget() {
-    unset(Fedora_Item::$instantiated_pids[$pid]);
+    unset(Fedora_Item::$instantiated_pids[$this->pid]);
   }
 
   /**