diff --git a/instances/heimdall/configuration.nix b/instances/heimdall/configuration.nix
index 41e9301..0d7dc77 100644
--- a/instances/heimdall/configuration.nix
+++ b/instances/heimdall/configuration.nix
@@ -104,6 +104,7 @@ in
         mqtt = {
           user = "zigbee2mqtt";
           password = "zigbee2mqtt";
+          client_id = "zigbee2mqtt";
         };
         frontend.enabled = true;
         permit_join = true;