diff --git a/src/shuffled/crypto.py b/src/shuffled/crypto.py
index d2f77e8..335b1dd 100644
--- a/src/shuffled/crypto.py
+++ b/src/shuffled/crypto.py
@@ -2,7 +2,6 @@
 from abc import ABC, abstractmethod
 from typing import Sequence
 
-from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
 
 from . import feistel
@@ -23,7 +22,7 @@ def domain_size(self) -> int:
         return 2**128
 
     def __init__(self, key: bytes) -> None:
-        cipher = Cipher(algorithms.AES(key), modes.ECB(), backend=default_backend())
+        cipher = Cipher(algorithms.AES(key), modes.ECB())
         self._encryptor = cipher.encryptor()
 
     def randomize(self, integer: int) -> int: