diff --git a/hassio/misc/hardware.py b/hassio/misc/hardware.py
index fbf9ae8df..073582b2d 100644
--- a/hassio/misc/hardware.py
+++ b/hassio/misc/hardware.py
@@ -38,7 +38,7 @@ class Hardware:
         for device in self.context.list_devices(subsystem='tty'):
             if 'ID_VENDOR' in device or RE_TTY.search(device.device_node):
                 dev_list.add(device.device_node)
-                dev_list.extend(device.device_links)
+                dev_list.update(device.device_links)
 
         return dev_list