diff --git a/trezorctl b/trezorctl
index 7646d4439..f890a2ae2 100755
--- a/trezorctl
+++ b/trezorctl
@@ -582,9 +582,9 @@ def ethereum_sign_message(connect, address, message):
 
 def ethereum_decode_hex(value):
     if value.startswith('0x') or value.startswith('0X'):
-        return value[2:].decode('hex')
+        return binascii.unhexlify(value[2:])
     else:
-        return value.decode('hex')
+        return binascii.unhexlify(value)
 
 
 @cli.command(help='Verify message signed with Ethereum address.')
@@ -731,7 +731,7 @@ def ethereum_sign_tx(connect, host, chain_id, address, value, gas_limit, gas_pri
 
     client = connect()
     address_n = client.expand_path(address)
-    address = '0x%s' % (binascii.hexlify(client.ethereum_get_address(address_n)),)
+    address = '0x%s' % (binascii.hexlify(client.ethereum_get_address(address_n)).decode())
 
     if gas_price is None or gas_limit is None or nonce is None:
         host, port = host.split(':')
@@ -749,7 +749,7 @@ def ethereum_sign_tx(connect, host, chain_id, address, value, gas_limit, gas_pri
             to_address=to,
             from_address=address,
             value=('0x%x' % value),
-            data='0x' + data)
+            data='0x%s' % (binascii.hexlify(data).decode()))
 
     if nonce is None:
         nonce = eth.eth_getTransactionCount(address)
@@ -766,7 +766,7 @@ def ethereum_sign_tx(connect, host, chain_id, address, value, gas_limit, gas_pri
 
     transaction = rlp.encode(
         (nonce, gas_price, gas_limit, to_address, value, data) + sig)
-    tx_hex = '0x%s' % binascii.hexlify(transaction)
+    tx_hex = '0x%s' % binascii.hexlify(transaction).decode()
 
     if publish:
         tx_hash = eth.eth_sendRawTransaction(tx_hex)