diff --git a/booking.emails.inc b/booking.emails.inc
index c5fd520..5e993c5 100644
--- a/booking.emails.inc
+++ b/booking.emails.inc
@@ -332,7 +332,7 @@ function _booking_custom_email($nid, $email_type, $sender = 'contact') {
 			'filename' => 'test.txt',
 			'filemime' => 'text/plain',
 		);		
-		$params['attachments'][] = $attachment;					
+		$params['attachment'] = $attachment;					
 	}
 
 	//load the node matching this id