diff --git a/src/Tahoe/SDMF/Internal/Share.hs b/src/Tahoe/SDMF/Internal/Share.hs
index e5bad8830d3d697073ce1a1c0f4cf4f30f44b7c5..989f0714f57be13589de2ceb8fd6e3b36d9554b3 100644
--- a/src/Tahoe/SDMF/Internal/Share.hs
+++ b/src/Tahoe/SDMF/Internal/Share.hs
@@ -3,8 +3,7 @@ module Tahoe.SDMF.Internal.Share where
 
 import Control.Monad (unless)
 import Crypto.Cipher.AES (AES128)
-import Crypto.Cipher.Types (Cipher (cipherInit), IV, makeIV)
-import Crypto.Error (maybeCryptoError)
+import Crypto.Cipher.Types (IV, makeIV)
 import qualified Crypto.PubKey.RSA.Types as RSA
 import Data.ASN1.BinaryEncoding (DER (DER))
 import Data.ASN1.Encoding (ASN1Encoding (encodeASN1), decodeASN1')