diff --git a/instances/heimdall/configuration.nix b/instances/heimdall/configuration.nix
index 25fba32..2cb33ed 100644
--- a/instances/heimdall/configuration.nix
+++ b/instances/heimdall/configuration.nix
@@ -97,7 +97,7 @@ in
           client_id = "zigbee2mqtt";
         };
         frontend.enabled = true;
-        permit_join = true;
+        # permit_join = true;
         serial = {
           port = "/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0";
           adapter = "ember";