diff --git a/trezorlib/transport_hid.py b/trezorlib/transport_hid.py
index a4e041636a..712685360a 100644
--- a/trezorlib/transport_hid.py
+++ b/trezorlib/transport_hid.py
@@ -57,7 +57,7 @@ class HidTransport(Transport):
     HidTransport implements transport over USB HID interface.
     '''
 
-    PATH_PREFIX = 'HID'
+    PATH_PREFIX = 'hid'
 
     def __init__(self, device, protocol=None, hid_handle=None):
         super(HidTransport, self).__init__()
diff --git a/trezorlib/transport_udp.py b/trezorlib/transport_udp.py
index b627517dfc..05037d72ed 100644
--- a/trezorlib/transport_udp.py
+++ b/trezorlib/transport_udp.py
@@ -30,7 +30,7 @@ class UdpTransport(Transport):
 
     DEFAULT_HOST = '127.0.0.1'
     DEFAULT_PORT = 21324
-    PATH_PREFIX = 'UDP'
+    PATH_PREFIX = 'udp'
 
     def __init__(self, device=None, protocol=None):
         super(UdpTransport, self).__init__()