diff --git a/modules/nixos/homeassistant/services/zigbee2mqtt/default.nix b/modules/nixos/homeassistant/services/zigbee2mqtt/default.nix
index e8cf952..b02e88f 100644
--- a/modules/nixos/homeassistant/services/zigbee2mqtt/default.nix
+++ b/modules/nixos/homeassistant/services/zigbee2mqtt/default.nix
@@ -16,9 +16,6 @@ in
         enable = true;
         listeners = [
           {
-            # Listen on all interfaces so LAN devices (e.g. openHASP) can connect
-            address = "0.0.0.0";
-            port = 1883;
             acl = [ "pattern readwrite #" ];
             omitPasswordAuth = true;
             settings.allow_anonymous = true;
diff --git a/systems/x86_64-linux/nuc-nixos/default.nix b/systems/x86_64-linux/nuc-nixos/default.nix
index 777d337..0a39ee7 100644
--- a/systems/x86_64-linux/nuc-nixos/default.nix
+++ b/systems/x86_64-linux/nuc-nixos/default.nix
@@ -56,6 +56,7 @@
         enable = true;
         allowPing = true;
         allowedTCPPorts = [
+          1883 # MQTT broker (mosquitto) for IoT devices
           8192
           8880
           8881