diff --git a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
index 399465938c20..48d5cffa4088 100644
--- a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
@@ -129,7 +129,7 @@ protected function getDumpHeader()
         e.addEventListener(n, cb, false);
     };
 
-doc.documentElement.firstChild.appendChild(refStyle);
+(doc.documentElement.firstElementChild || doc.documentElement.children[0]).appendChild(refStyle);
 
 if (!doc.addEventListener) {
     addEventListener = function (element, eventName, callback) {