diff --git a/ETwigViewRenderer.php b/ETwigViewRenderer.php
index 7288b12..53a8b5f 100644
--- a/ETwigViewRenderer.php
+++ b/ETwigViewRenderer.php
@@ -191,6 +191,7 @@ public function addFilters($filters)
     public function addExtensions($extensions)
     {
         foreach ($extensions as $extName) {
+            $extName = Yii::import($extName);
             $this->_twig->addExtension(new $extName());
         }
     }