diff --git a/miio/cli.py b/miio/cli.py
index 9af8a1c58..3feb1d948 100644
--- a/miio/cli.py
+++ b/miio/cli.py
@@ -39,7 +39,7 @@ def cli(ctx, debug: int, output: str):
     ctx.obj = GlobalContextObject(debug=debug, output=output_func)
 
 
-for device_class in DeviceGroupMeta.device_classes:
+for device_class in DeviceGroupMeta._device_classes:
     cli.add_command(device_class.get_device_group())
 
 
diff --git a/miio/click_common.py b/miio/click_common.py
index 01fe16ecd..4ba9e94b1 100644
--- a/miio/click_common.py
+++ b/miio/click_common.py
@@ -117,7 +117,7 @@ def __init__(self, debug: int = 0, output: Callable = None):
 
 class DeviceGroupMeta(type):
 
-    device_classes: Set[Type] = set()
+    _device_classes: Set[Type] = set()
 
     def __new__(mcs, name, bases, namespace):
         commands = {}
@@ -150,7 +150,7 @@ def get_device_group(dcls):
             namespace["get_device_group"] = classmethod(get_device_group)
 
         cls = super().__new__(mcs, name, bases, namespace)
-        mcs.device_classes.add(cls)
+        mcs._device_classes.add(cls)
         return cls