diff --git a/src/nitrokey/trussed/_bootloader/nrf52_upload/lister/unix/unix_lister.py b/src/nitrokey/trussed/_bootloader/nrf52_upload/lister/unix/unix_lister.py
index 385bb70..22529da 100644
--- a/src/nitrokey/trussed/_bootloader/nrf52_upload/lister/unix/unix_lister.py
+++ b/src/nitrokey/trussed/_bootloader/nrf52_upload/lister/unix/unix_lister.py
@@ -37,13 +37,12 @@
 
 import sys
 
+from ..enumerated_device import EnumeratedDevice
 from ..lister_backend import AbstractLister
 
 if "linux" in sys.platform or sys.platform == "darwin":
     import serial.tools.list_ports
 
-    from ..enumerated_device import EnumeratedDevice
-
 
 def create_id_string(sno: str, PID: str, VID: str) -> str:
     return "{}-{}-{}".format(sno, PID, VID)