diff --git a/bip-0328/_xpub.py b/bip-0328/_xpub.py
index 004b5933ef..55917063f6 100644
--- a/bip-0328/_xpub.py
+++ b/bip-0328/_xpub.py
@@ -133,7 +133,9 @@ def deserialize(cls, xpub: str) -> 'ExtendedKey':
 
         :param xpub: The Base58 check encoded xpub
         """
-        data = base58.decode(xpub)[:-4] # Decoded xpub without checksum
+        data = base58.decode_check(xpub)
+        if len(data) != 78:  # BIP32 Serialization Format defines a 78-byte structure.
+            raise ValueError("Invalid extended key length")
         return cls.from_bytes(data)
 
     @classmethod