diff --git a/instances/heimdall/configuration.nix b/instances/heimdall/configuration.nix
index 4d8f747..af91642 100644
--- a/instances/heimdall/configuration.nix
+++ b/instances/heimdall/configuration.nix
@@ -71,6 +71,8 @@ in
     Defaults pwfeedback
   '';
 
+  users.users.zigbee2mqtt.extraGroups = [ "dialout" ];
+
   services = {
     mosquitto = {
       enable = true;