diff --git a/classes/mqxmlconverter.php b/classes/mqxmlconverter.php
index e3be70c..8a84987 100644
--- a/classes/mqxmlconverter.php
+++ b/classes/mqxmlconverter.php
@@ -39,6 +39,9 @@ class mqxmlconverter {
     /** @var string Stylesheet to import XHTML into question XML */
     private $xhtml2mqxmlstylesheet = __DIR__ . "/xhtml2mqxml.xsl";
 
+    /** @var array XSLT parameters */
+    private $xsltparameters = [];
+
     /**
      * Class constructor
      *