diff --git a/src/Query.php b/src/Query.php
index ec6da1f..8ae0943 100644
--- a/src/Query.php
+++ b/src/Query.php
@@ -238,6 +238,7 @@ public function queryXpath($xpathQuery, $query = null, DOMNode $contextNode = nu
             $domDoc = new DOMDocument('1.0');
         } else {
             $domDoc = new DOMDocument('1.0', $encoding);
+            $document = mb_convert_encoding($document, 'HTML-ENTITIES', $encoding);
         }
         $type   = $this->getDocumentType();
         switch ($type) {