diff --git a/src/Sanitizer.php b/src/Sanitizer.php
index 731b8c7..9fcab00 100644
--- a/src/Sanitizer.php
+++ b/src/Sanitizer.php
@@ -364,7 +364,7 @@ protected function startClean(\DOMNodeList $elements, array $elementsToRemove)
                     $breaksOutOfForeignContent = false;
                     for ($x = $currentElement->attributes->length - 1; $x >= 0; $x--) {
                         // get attribute name
-                        $attrName = $currentElement->attributes->item( $x )->name;
+                        $attrName = $currentElement->attributes->item( $x )->nodeName;
 
                         if (in_array(strtolower($attrName), ['face', 'color', 'size'])) {
                             $breaksOutOfForeignContent = true;
@@ -399,7 +399,7 @@ protected function cleanAttributesOnWhitelist(\DOMElement $element)
     {
         for ($x = $element->attributes->length - 1; $x >= 0; $x--) {
             // get attribute name
-            $attrName = $element->attributes->item($x)->name;
+            $attrName = $element->attributes->item($x)->nodeName;
 
             // Remove attribute if not in whitelist
             if (!in_array(strtolower($attrName), $this->allowedAttrs) && !$this->isAriaAttribute(strtolower($attrName)) && !$this->isDataAttribute(strtolower($attrName))) {