diff --git a/trezorlib/transport_hid.py b/trezorlib/transport_hid.py
index 93219d6..572687d 100644
--- a/trezorlib/transport_hid.py
+++ b/trezorlib/transport_hid.py
@@ -2,8 +2,7 @@
 
 import hid
 import time
-import platform
-from transport import Transport, ConnectionError, NotImplementedException
+from transport import Transport, ConnectionError
 
 DEVICE_IDS = [
 #    (0x10c4, 0xea80),  # TREZOR Shield