diff --git a/hassio/api/addons.py b/hassio/api/addons.py
index 5509713eb..f98a19098 100644
--- a/hassio/api/addons.py
+++ b/hassio/api/addons.py
@@ -55,7 +55,7 @@ class APIAddons(object):
         dev_list = addon.devices
         if not dev_list:
             return
-        return set(row.split(':')[0] for row in dev_list)
+        return [row.split(':')[0] for row in dev_list]
 
     @api_process
     async def list(self, request):