diff --git a/core/src/trezor/wire/thp/thp_messages.py b/core/src/trezor/wire/thp/thp_messages.py
index a06706059..2322d6b15 100644
--- a/core/src/trezor/wire/thp/thp_messages.py
+++ b/core/src/trezor/wire/thp/thp_messages.py
@@ -12,8 +12,9 @@ CONTINUATION_PACKET = 0x80
 ENCRYPTED_TRANSPORT = 0x02
 HANDSHAKE_INIT = 0x00
 ACK_MESSAGE = 0x20
-_ERROR = 0x41
-_CHANNEL_ALLOCATION_RES = 0x40
+_ERROR = 0x42
+CHANNEL_ALLOCATION_REQ = 0x40
+_CHANNEL_ALLOCATION_RES = 0x41
 
 TREZOR_STATE_UNPAIRED = b"\x00"
 TREZOR_STATE_PAIRED = b"\x01"
diff --git a/core/src/trezor/wire/thp_v1.py b/core/src/trezor/wire/thp_v1.py
index ea0aa9a95..d2069f930 100644
--- a/core/src/trezor/wire/thp_v1.py
+++ b/core/src/trezor/wire/thp_v1.py
@@ -16,14 +16,13 @@ from .thp.channel import (
     load_cached_channels,
 )
 from .thp.checksum import CHECKSUM_LENGTH
-from .thp.thp_messages import CODEC_V1, InitHeader
+from .thp.thp_messages import CHANNEL_ALLOCATION_REQ, CODEC_V1, InitHeader
 from .thp.thp_session import ThpError
 
 if TYPE_CHECKING:
     from trezorio import WireInterface  # pyright: ignore[reportMissingImports]
 
 _MAX_CID_REQ_PAYLOAD_LENGTH = const(12)  # TODO set to reasonable value
-_CHANNEL_ALLOCATION_REQ = 0x40
 
 
 _BUFFER: bytearray
@@ -137,7 +136,7 @@ async def _handle_broadcast(
     iface: WireInterface, ctrl_byte, packet
 ) -> MessageWithId | None:
     global _BUFFER
-    if ctrl_byte != _CHANNEL_ALLOCATION_REQ:
+    if ctrl_byte != CHANNEL_ALLOCATION_REQ:
         raise ThpError("Unexpected ctrl_byte in broadcast channel packet")
     if __debug__:
         log.debug(__name__, "Received valid message on broadcast channel ")