diff --git a/vsftp_ftps_implicit.conf b/vsftp_ftps_implicit.conf
index 12aed32..2b478ff 100644
--- a/vsftp_ftps_implicit.conf
+++ b/vsftp_ftps_implicit.conf
@@ -150,3 +150,4 @@ pasv_max_port=21110
 
 #enable implicit SSL
 implicit_ssl=true
+listen_port=990