diff --git a/lib/php/src/Thrift.php b/lib/php/src/Thrift.php
index 0364c90..1dbf64b 100644
--- a/lib/php/src/Thrift.php
+++ b/lib/php/src/Thrift.php
@@ -68,6 +68,7 @@
  * @param mixed $p1 Message (string) or type-spec (array)
  * @param mixed $p2 Code (integer) or values (array)
  */
+#[\AllowDynamicProperties]
 class TException extends Exception
 {
   public function __construct($p1=null, $p2=0)
@@ -419,6 +420,7 @@
  * of PHP. Note that code is intentionally duplicated in here to avoid making
  * function calls for every field or member of a container..
  */
+#[\AllowDynamicProperties]
 abstract class TBase
 {
   static $tmethod = array(TType::BOOL   => 'Bool',