diff --git a/htdocs/includes/simplemail/class.mail.php b/htdocs/includes/simplemail/class.mail.php
index d19a8050476..a5c7bb60342 100644
--- a/htdocs/includes/simplemail/class.mail.php
+++ b/htdocs/includes/simplemail/class.mail.php
@@ -11,6 +11,7 @@ class simplemail {
 
 	var $Xsender;
 	var $ErrorsTo;
+	var $returnpath;
 	var $XMailer = 'PHP';
 	var $XPriority = 3;