diff --git a/hswaw/machines/sound.waw.hackerspace.pl/configuration.nix b/hswaw/machines/sound.waw.hackerspace.pl/configuration.nix
index d1a9b4ca..8397caec 100644
--- a/hswaw/machines/sound.waw.hackerspace.pl/configuration.nix
+++ b/hswaw/machines/sound.waw.hackerspace.pl/configuration.nix
@@ -193,6 +193,7 @@ in {
         22 # ssh
         80 # nginx http
         1883 # mqtt (mosquitto)
+        8883 # tls mqtt (mosquitto)
         4713 # pulseaudo
     ];
   };