diff --git a/aiohasupervisor/models/root.py b/aiohasupervisor/models/root.py
index ad72d49..2b708ab 100644
--- a/aiohasupervisor/models/root.py
+++ b/aiohasupervisor/models/root.py
@@ -86,6 +86,7 @@ class RootInfo(ResponseData):
     operating_system: str | None
     features: list[HostFeature | str]
     machine: str | None
+    machine_id: str | None
     arch: str
     state: SupervisorState
     supported_arch: list[str]
diff --git a/tests/fixtures/root_info.json b/tests/fixtures/root_info.json
index 053fc87..e4c3643 100644
--- a/tests/fixtures/root_info.json
+++ b/tests/fixtures/root_info.json
@@ -23,6 +23,7 @@
       "not_real"
     ],
     "machine": "odroid-n2",
+    "machine_id": "2403f24a7b9840c0a6c63ae9357948e8",
     "arch": "aarch64",
     "state": "running",
     "supported_arch": ["aarch64", "armv7", "armhf"],