diff --git a/instances/heimdall/configuration.nix b/instances/heimdall/configuration.nix
index af91642..075f89c 100644
--- a/instances/heimdall/configuration.nix
+++ b/instances/heimdall/configuration.nix
@@ -103,9 +103,9 @@ in
       settings = {
         homeassistant = config.services.home-assistant.enable;
         permit_join = true;
-        # serial = {
-        #   port = "/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0";
-        # };
+        serial = {
+          port = "/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0";
+        };
       };
     };
     grafana = {