diff --git a/two1/bitcoin/crypto.py b/two1/bitcoin/crypto.py
index 215e1f50..e03cd253 100644
--- a/two1/bitcoin/crypto.py
+++ b/two1/bitcoin/crypto.py
@@ -1476,7 +1476,7 @@ def identifier(self):
         return self.public_key.hash160()
 
     def __int__(self):
-        return int(self.key)
+        return int(self._key)
 
 
 class HDPublicKey(HDKey, PublicKeyBase):