diff --git a/btcpy/structs/hd.py b/btcpy/structs/hd.py
index ffa2cad..8443a90 100644
--- a/btcpy/structs/hd.py
+++ b/btcpy/structs/hd.py
@@ -36,7 +36,7 @@ def master(cls, key, chaincode):
     
     @classmethod
     def decode(cls, string, check_network=True):
-        if string[0] == 'x':
+        if string[0] == 'x' or string[0] == 'y':
             mainnet = True
         elif string[0] == 't':
             mainnet = False