diff --git a/lib/Twig/Markup.php b/lib/Twig/Markup.php
index 878ee074a..9b8f63032 100644
--- a/lib/Twig/Markup.php
+++ b/lib/Twig/Markup.php
@@ -21,7 +21,7 @@ class Twig_Markup extends Exception
 
     public function __construct($content)
     {
-        $this->content = $content;
+        $this->content = (string) $content;
     }
 
     public function __toString()