diff --git a/plugins/FeedsSimplePieParser.inc b/plugins/FeedsSimplePieParser.inc
index fa37a57..cfea397 100644
--- a/plugins/FeedsSimplePieParser.inc
+++ b/plugins/FeedsSimplePieParser.inc
@@ -6,6 +6,7 @@
  */
 class FeedsSimplePieEnclosure extends FeedsEnclosure {
   protected $simplepie_enclosure;
+  private $_serialized_simplepie_enclosure;
 
   /**
    * Constructor requires SimplePie enclosure object.
@@ -15,6 +16,26 @@ class FeedsSimplePieEnclosure extends FeedsEnclosure {
   }
 
   /**
+   * Serialization helper.
+   *
+   * Handle the simplepie enclosure class seperately ourselves.
+   */
+  public function __sleep() {
+    $this->_serialized_simplepie_enclosure = serialize($this->simplepie_enclosure);
+    return array('_serialized_simplepie_enclosure');
+  }
+
+  /**
+   * Unserialization helper.
+   *
+   * Ensure that the simplepie class definitions are loaded for the enclosure when unserializing.
+   */
+   public function __wakeup() {
+    feeds_include_library('simplepie.inc', 'simplepie');
+    $this->simplepie_enclosure = unserialize($this->_serialized_simplepie_enclosure);
+  }
+
+  /**
    * Override parent::getValue().
    */
   public function getValue() {