diff --git a/trezorlib/client.py b/trezorlib/client.py
index a7e5cd7a6..e11f09a67 100644
--- a/trezorlib/client.py
+++ b/trezorlib/client.py
@@ -1092,10 +1092,8 @@ class ProtocolMixin(object):
 
     @expect(proto.RippleSignedTx)
     def ripple_sign_tx(self, n, transaction):
-        ripple.validate(transaction)
-        n = self._convert_prime(n)
         msg = ripple.create_sign_tx(transaction)
-        msg.address_n = n
+        msg.address_n = tools.parse_path(n)
         return self.call(msg)
 
     @field('public_key')
diff --git a/trezorlib/ripple.py b/trezorlib/ripple.py
index 998ad7175..908b117a2 100644
--- a/trezorlib/ripple.py
+++ b/trezorlib/ripple.py
@@ -16,33 +16,27 @@
 
 import base64
 import struct
-import xdrlib
 
-from . import messages as proto
+from . import messages
 
 
-def validate(transaction):
-    if False in (k in transaction for k in ("Fee", "Sequence", "TransactionType", "Amount", "Destination")):
+def create_sign_tx(transaction) -> messages.RippleSignTx:
+    if not all(transaction.get(k) for k in ("Fee", "Sequence", "TransactionType", "Amount", "Destination")):
         raise ValueError("Some of the required fields missing (Fee, Sequence, TransactionType, Amount, Destination")
     if transaction["TransactionType"] != "Payment":
         raise ValueError("Only Payment transaction type is supported")
 
+    return messages.RippleSignTx(
+        fee=transaction.get("Fee"),
+        sequence=transaction.get("Sequence"),
+        flags=transaction.get("Flags"),
+        last_ledger_sequence=transaction.get("LastLedgerSequence"),
+        payment=create_payment(transaction),
+    )
 
-def create_sign_tx(transaction) -> proto.RippleSignTx:
-    msg = proto.RippleSignTx()
-    msg.fee = transaction["Fee"]
-    msg.sequence = transaction["Sequence"]
-    if "Flags" in transaction:
-        msg.flags = transaction["Flags"]
-    if "LastLedgerSequence" in transaction:
-        msg.last_ledger_sequence = transaction["LastLedgerSequence"]
 
-    msg.payment = create_payment(transaction)
-    return msg
-
-
-def create_payment(transaction) -> proto.RipplePayment:
-    msg = proto.RipplePayment()
-    msg.amount = transaction["Amount"]
-    msg.destination = transaction["Destination"]
-    return msg
+def create_payment(transaction) -> messages.RipplePayment:
+    return messages.RipplePayment(
+        amount=transaction.get("Amount"),
+        destination=transaction.get("Destination")
+    )
diff --git a/trezorlib/tests/device_tests/test_msg_ripple_get_address.py b/trezorlib/tests/device_tests/test_msg_ripple_get_address.py
index bed741ebc..3c2d2a4a7 100644
--- a/trezorlib/tests/device_tests/test_msg_ripple_get_address.py
+++ b/trezorlib/tests/device_tests/test_msg_ripple_get_address.py
@@ -19,7 +19,6 @@ import pytest
 from .common import TrezorTest
 from .conftest import TREZOR_VERSION
 from binascii import hexlify
-from trezorlib import messages as proto
 from trezorlib.client import CallException
 from trezorlib.tools import parse_path
 
diff --git a/trezorlib/tests/device_tests/test_msg_stellar_get_public_key.py b/trezorlib/tests/device_tests/test_msg_stellar_get_public_key.py
index 4a531b59e..1442d9795 100644
--- a/trezorlib/tests/device_tests/test_msg_stellar_get_public_key.py
+++ b/trezorlib/tests/device_tests/test_msg_stellar_get_public_key.py
@@ -20,7 +20,7 @@ from .common import TrezorTest
 from .conftest import TREZOR_VERSION
 from binascii import hexlify
 from trezorlib import stellar
-from trezorlib import messages as proto
+from trezorlib import messages
 from trezorlib.client import CallException
 from trezorlib.tools import parse_path
 
@@ -43,8 +43,8 @@ class TestMsgStellarGetPublicKey(TrezorTest):
             self.client.stellar_get_public_key(parse_path('m/0/1'))
 
         if TREZOR_VERSION == 1:
-            assert exc.value.args[0] == proto.FailureType.ProcessError
+            assert exc.value.args[0] == messages.FailureType.ProcessError
             assert exc.value.args[1].endswith('Failed to derive private key')
         else:
-            assert exc.value.args[0] == proto.FailureType.FirmwareError
+            assert exc.value.args[0] == messages.FailureType.FirmwareError
             assert exc.value.args[1].endswith('Firmware error')