diff --git a/tests/ragger/app/client.py b/tests/ragger/app/client.py
index 7e25093..6904c87 100644
--- a/tests/ragger/app/client.py
+++ b/tests/ragger/app/client.py
@@ -91,8 +91,8 @@ class EthereumClient:
             self._disable_click_until_response()
             assert self._recv().status == 0x9000
 
-    def eip712_sign_new(self, bip32):
-        with self._send(self._cmd_builder.eip712_sign_new(bip32)):
+    def eip712_sign_new(self, bip32_path: str):
+        with self._send(self._cmd_builder.eip712_sign_new(bip32_path)):
             time.sleep(0.5) # tight on timing, needed by the CI otherwise might fail sometimes
             if not self._settings[SettingType.VERBOSE_EIP712].value and \
                not self._eip712_filtering: # need to skip the message hash
@@ -104,10 +104,10 @@ class EthereumClient:
         return self._resp_parser.sign(resp.data)
 
     def eip712_sign_legacy(self,
-                           bip32,
+                           bip32_path: str,
                            domain_hash: bytes,
                            message_hash: bytes):
-        with self._send(self._cmd_builder.eip712_sign_legacy(bip32,
+        with self._send(self._cmd_builder.eip712_sign_legacy(bip32_path,
                                                              domain_hash,
                                                              message_hash)):
             self._client.right_click() # sign typed message screen
diff --git a/tests/ragger/app/command_builder.py b/tests/ragger/app/command_builder.py
index 04fdc20..9dea245 100644
--- a/tests/ragger/app/command_builder.py
+++ b/tests/ragger/app/command_builder.py
@@ -1,6 +1,7 @@
 from enum import IntEnum, auto
 from typing import Iterator, Optional
 from .eip712 import EIP712FieldType
+from ragger.bip import pack_derivation_path
 import struct
 
 class InsType(IntEnum):
@@ -110,28 +111,18 @@ class EthereumCmdBuilder:
                                   data_w_length[:0xff])
             data_w_length = data_w_length[0xff:]
 
-    def _format_bip32(self, path: list[Optional[int]], data: bytearray) -> bytearray:
-        data.append(len(path))
-        for p in path:
-            if p == None:
-                val = 0
-            else:
-                val = (0x8 << 28) | p
-            data += struct.pack(">I", val)
-        return data
-
-    def eip712_sign_new(self, bip32_path: list[Optional[int]]) -> bytes:
-        data = self._format_bip32(bip32_path, bytearray())
+    def eip712_sign_new(self, bip32_path: str) -> bytes:
+        data = pack_derivation_path(bip32_path)
         return self._serialize(InsType.EIP712_SIGN,
                                P1Type.COMPLETE_SEND,
                                P2Type.NEW_IMPLEM,
                                data)
 
     def eip712_sign_legacy(self,
-                           bip32_path: list[Optional[int]],
+                           bip32_path: str,
                            domain_hash: bytes,
                            message_hash: bytes) -> bytes:
-        data = self._format_bip32(bip32_path, bytearray())
+        data = pack_derivation_path(bip32_path)
         data += domain_hash
         data += message_hash
         return self._serialize(InsType.EIP712_SIGN,
diff --git a/tests/ragger/test_eip712.py b/tests/ragger/test_eip712.py
index 51cc773..29cb843 100644
--- a/tests/ragger/test_eip712.py
+++ b/tests/ragger/test_eip712.py
@@ -7,13 +7,7 @@ from eip712 import InputData
 from pathlib import Path
 from configparser import ConfigParser
 
-bip32_path = [
-    44,
-    60,
-    0,
-    None,
-    None
-]
+BIP32_PATH = "m/44'/60'/0'/0/0"
 
 
 def input_files() -> List[str]:
@@ -38,7 +32,7 @@ def filtering(request) -> bool:
 
 def test_eip712_legacy(app_client: EthereumClient):
     v, r, s = app_client.eip712_sign_legacy(
-        bip32_path,
+        BIP32_PATH,
         bytes.fromhex('6137beb405d9ff777172aa879e33edb34a1460e701802746c5ef96e741710e59'),
         bytes.fromhex('eb4221181ff3f1a83ea7313993ca9218496e424604ba9492bb4052c03d5c3df8')
     )
@@ -74,7 +68,7 @@ def test_eip712_new(app_client: EthereumClient, input_file: Path, verbose: bool,
                 })
 
             assert InputData.process_file(app_client, input_file, filter_file) == True
-            v, r, s = app_client.eip712_sign_new(bip32_path)
+            v, r, s = app_client.eip712_sign_new(BIP32_PATH)
             #print("[signature]")
             #print("v = %s" % (v.hex()))
             #print("r = %s" % (r.hex()))