diff --git a/src/Zend/Media/Iso14496.php b/src/Zend/Media/Iso14496.php
index 967f0d5..966986c 100644
--- a/src/Zend/Media/Iso14496.php
+++ b/src/Zend/Media/Iso14496.php
@@ -256,6 +256,9 @@ final class Zend_Media_Iso14496 extends Zend_Media_Iso14496_Box
     /** @var string */
     private $_filename;
 
+    /** @var boolean */
+    private $_autoClose = false;
+
     /**
      * Constructs the Zend_Media_Iso14496 class with given file and options.
      *
@@ -283,6 +286,7 @@ final class Zend_Media_Iso14496 extends Zend_Media_Iso14496_Box
             require_once 'Zend/Io/FileReader.php';
             try {
                 $this->_reader = new Zend_Io_FileReader($filename);
+                $this->_autoClose = true;
             } catch (Zend_Io_Exception $e) {
                 $this->_reader = null;
                 require_once 'Zend/Media/Iso14496/Exception.php';
@@ -300,6 +304,17 @@ final class Zend_Media_Iso14496 extends Zend_Media_Iso14496_Box
         $this->constructBoxes();
     }
 
+    /**
+     * Closes down the reader.
+     */
+    public function __destruct()
+    {
+        parent::__destruct();
+        if ($this->_autoClose === true && $this->_reader !== null) {
+            $this->_reader->close();
+        }
+    }
+
     /**
      * Writes the changes back to given media file.
      *