diff --git a/tests/pico-hsm/test_050_cipher.py b/tests/pico-hsm/test_050_cipher.py
index 24a2f2a..448d978 100644
--- a/tests/pico-hsm/test_050_cipher.py
+++ b/tests/pico-hsm/test_050_cipher.py
@@ -47,6 +47,6 @@ def test_cipher_aes_cipher(device, size):
     decryptor = cipher.decryptor()
     plA = decryptor.update(ctA) + decryptor.finalize()
     plB = device.cipher(Algorithm.ALGO_AES_CBC_DECRYPT, keyid, ctA)
-    device.delete_file(DOPrefixes.KEY_PREFIX.value << 8 | keyid)
+    device.delete_file(DOPrefixes.KEY_PREFIX.value, keyid)
     assert(bytes(plB) == plA)
     assert(bytes(plB) == MESSAGE)