diff --git a/src/QueryPath/CSS/Parser.php b/src/QueryPath/CSS/Parser.php
index f0416129..cc5fd155 100644
--- a/src/QueryPath/CSS/Parser.php
+++ b/src/QueryPath/CSS/Parser.php
@@ -21,6 +21,7 @@
  *
  * @ingroup querypath_css
  */
+#[\AllowDynamicProperties]
 class Parser {
   protected $scanner = NULL;
   protected $buffer = '';