diff --git a/docs/Self-signed-Mosquitto.md b/docs/Self-signed-Mosquitto.md
index 45bc4a044e..c62694c73b 100644
--- a/docs/Self-signed-Mosquitto.md
+++ b/docs/Self-signed-Mosquitto.md
@@ -306,7 +306,7 @@ Edit `/etc/mosquitto/conf.d/default.conf` as following:
 ```
 protocol mqtt
 allow_anonymous false
-listener 8884
+listener 8883
 socket_domain ipv4
 # Certs and Keys
 cafile /etc/mosquitto/ca_certificates/ca.crt