diff --git a/PhpAmqpLib/Helper/Protocol/Protocol080.php b/PhpAmqpLib/Helper/Protocol/Protocol080.php
index 63b86d8e..f107e0cc 100644
--- a/PhpAmqpLib/Helper/Protocol/Protocol080.php
+++ b/PhpAmqpLib/Helper/Protocol/Protocol080.php
@@ -331,7 +331,7 @@ public static function exchangeDeclareOk(AMQPReader $reader)
      * @param bool $nowait
      * @return array
      */
-    public function exchangeDelete($ticket = 1, $exchange, $if_unused = false, $nowait = false)
+    public function exchangeDelete($ticket = 1, $exchange = '', $if_unused = false, $nowait = false)
     {
         $writer = new AMQPWriter();
         $writer->write_short($ticket);