diff --git a/src/middlewared/middlewared/plugins/device.py b/src/middlewared/middlewared/plugins/device.py
index 9ec7440861e87..c7e61cf161009 100644
--- a/src/middlewared/middlewared/plugins/device.py
+++ b/src/middlewared/middlewared/plugins/device.py
@@ -16,5 +16,5 @@ async def get_info(self, data):
         if method == 'device.get_disks':
             return await self.middleware.call(method, data['get_partitions'], data['serials_only'])
         elif method == 'device.get_serials':
-            return await self.middleware.run_in_thread(serial_port_choices())
+            return await self.middleware.run_in_thread(serial_port_choices)
         return await self.middleware.call(method)