diff --git a/classes/request/soap.php b/classes/request/soap.php
index 2fb9f8deec..10d8ab0d4c 100644
--- a/classes/request/soap.php
+++ b/classes/request/soap.php
@@ -162,8 +162,11 @@ public function execute(array $additional_params = array())
 	 */
 	protected function set_defaults()
 	{
-		parent::set_defaults();
-		$this->function = '';
+		if (empty($this->options['trace']))
+		{
+			parent::set_defaults();
+			$this->function = '';
+		}
 
 		return $this;
 	}