diff --git a/python/src/trezorlib/ethereum.py b/python/src/trezorlib/ethereum.py
index da28442812..cd3719694e 100644
--- a/python/src/trezorlib/ethereum.py
+++ b/python/src/trezorlib/ethereum.py
@@ -56,22 +56,16 @@ def sign_tx(
         gas_price=int_to_big_endian(gas_price),
         gas_limit=int_to_big_endian(gas_limit),
         value=int_to_big_endian(value),
+        to=to,
+        chain_id=chain_id,
+        tx_type=tx_type,
     )
 
-    if to:
-        msg.to = to
-
     if data:
         msg.data_length = len(data)
         data, chunk = data[1024:], data[:1024]
         msg.data_initial_chunk = chunk
 
-    if chain_id:
-        msg.chain_id = chain_id
-
-    if tx_type is not None:
-        msg.tx_type = tx_type
-
     response = client.call(msg)
 
     while response.data_length is not None: