diff --git a/lib/Twig/Environment.php b/lib/Twig/Environment.php
index 65e3e6c0a..3155f09c9 100644
--- a/lib/Twig/Environment.php
+++ b/lib/Twig/Environment.php
@@ -198,7 +198,7 @@ class Twig_Environment
   {
     foreach ($extensions as $extension)
     {
-      $this->setExtension($extension);
+      $this->addExtension($extension);
     }
   }