diff --git a/hdwallet/seeds/cardano.py b/hdwallet/seeds/cardano.py
index 9fb3fa1..0130092 100644
--- a/hdwallet/seeds/cardano.py
+++ b/hdwallet/seeds/cardano.py
@@ -16,7 +16,7 @@
 from ..cryptocurrencies import Cardano
 from ..crypto import blake2b_256
 from ..exceptions import (
-    Error, MnemonicError
+    Error, MnemonicError, SeedError
 )
 from ..utils import (
     get_bytes, bytes_to_string