diff --git a/src/voku/helper/HtmlDomHelper.php b/src/voku/helper/HtmlDomHelper.php
index d0454d8..3d73b87 100644
--- a/src/voku/helper/HtmlDomHelper.php
+++ b/src/voku/helper/HtmlDomHelper.php
@@ -64,7 +64,7 @@ public static function mergeHtmlAttributes(
         }
 
         foreach ($attributes as $attributeName => $attributeValue) {
-            $domElement->setAttribute($attributeName, $attributeValue);
+            $domElement->setAttribute($attributeName, $attributeValue, true);
         }
 
         return $domElement->html();