diff --git a/Tests/Tests.hs b/Tests/Tests.hs
--- a/Tests/Tests.hs
+++ b/Tests/Tests.hs
@@ -13,6 +13,7 @@
 
 import Data.Byteable
 import qualified Data.ByteString as B
+import Data.ByteString.Char8 () -- orphan IsString for older bytestring versions
 import qualified Crypto.Cipher.DES as DES
 import Crypto.Cipher.Types
 import Crypto.Cipher.Tests
diff --git a/cipher-des.cabal b/cipher-des.cabal
--- a/cipher-des.cabal
+++ b/cipher-des.cabal
@@ -1,5 +1,5 @@
 Name:                cipher-des
-Version:             0.0.3
+Version:             0.0.4
 Description:         DES and 3DES primitives
 License:             BSD3
 License-file:        LICENSE