diff --git a/src/Zend/Media/Iso14496/Box/Trex.php b/src/Zend/Media/Iso14496/Box/Trex.php
index a98331e..78cc6b1 100644
--- a/src/Zend/Media/Iso14496/Box/Trex.php
+++ b/src/Zend/Media/Iso14496/Box/Trex.php
@@ -120,7 +120,7 @@ final class Zend_Media_Iso14496_Box_Trex extends Zend_Media_Iso14496_FullBox
      *
      * @param integer $defaultSampleDescriptionIndex The description index.
      */
-    public function getDefaultSampleDescriptionIndex
+    public function setDefaultSampleDescriptionIndex
         ($defaultSampleDescriptionIndex)
     {
         $this->_defaultSampleDescriptionIndex = $defaultSampleDescriptionIndex;