diff --git a/hosts/rpi4/services.nix b/hosts/rpi4/services.nix
index 3aa6145..404a43c 100644
--- a/hosts/rpi4/services.nix
+++ b/hosts/rpi4/services.nix
@@ -120,6 +120,9 @@
       storageDriver = "btrfs";
     };
 
+    # needed for mDNS in Home Assistant
+    networking.firewall.allowedUDPPorts = [ 5353 ];
+
     systemd.services.libreddit.environment = {
       LIBREDDIT_DEFAULT_SUBSCRIPTIONS = lib.pipe ./reddit-subscriptions.txt [
         builtins.readFile