diff --git a/testing/test_usb.py b/testing/test_usb.py
index 78c54285..65701963 100644
--- a/testing/test_usb.py
+++ b/testing/test_usb.py
@@ -7,6 +7,7 @@
 import pytest, struct
 from pycoin.key.BIP32Node import BIP32Node
 from binascii import b2a_hex
+from constants import simulator_fixed_tprv
 from ckcc_protocol.protocol import MAX_MSG_LEN, CCProtocolPacker, CCProtoError
 
 @pytest.mark.skip
@@ -84,9 +85,11 @@ def test_xpub_good(dev, master_xpub, path):
 
     assert k.hwif() == xpub
 
-    mk = BIP32Node.from_wallet_key(master_xpub)
-    sk = mk.subkey_for_path(path[2:].replace("h", "'"))
-    assert sk.hwif() == xpub
+    is_hard = ("'" in path) or ("h" in path)
+    if not is_hard or dev.is_simulator:
+        mk = BIP32Node.from_wallet_key(simulator_fixed_tprv if is_hard else master_xpub)
+        sk = mk.subkey_for_path(path[2:].replace("h", "'"))
+        assert sk.hwif() == xpub
 
     if len(path) <= 2:
         assert mk.fingerprint() == struct.pack('<I', dev.master_fingerprint)