diff --git a/bitcoin/deterministic.py b/bitcoin/deterministic.py
index 36b1b63e..71876a36 100644
--- a/bitcoin/deterministic.py
+++ b/bitcoin/deterministic.py
@@ -161,7 +161,7 @@ def raw_crack_bip32_privkey(parent_pub, priv):
 
     pprivkey = subtract_privkeys(key, I[:32]+b'\x01')
 
-    newvbytes = MAINNET_PRIVATE if vbytes == MAINNET_PUBLIC else TESTNET_PRIVATE
+    newvbytes = MAINNET_PRIVATE if pvbytes == MAINNET_PUBLIC else TESTNET_PRIVATE
     return (newvbytes, pdepth, pfingerprint, pi, pchaincode, pprivkey)