diff --git a/Crypto/Modes.hs b/Crypto/Modes.hs
--- a/Crypto/Modes.hs
+++ b/Crypto/Modes.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-|
  Maintainer: Thomas.DuBuisson@gmail.com
  Stability: beta
@@ -41,6 +42,10 @@
 import Crypto.Random
 import System.Crypto.Random (getEntropy)
 import Control.Monad (liftM)
+#if MIN_VERSION_tagged(0,2,0)
+import Data.Proxy
+#endif
+
 
 -- |Initilization Vectors for BlockCipher implementations (IV k) are used
 -- for various modes and guarrenteed to be blockSize bits long.  The common
diff --git a/Crypto/Random.hs b/Crypto/Random.hs
--- a/Crypto/Random.hs
+++ b/Crypto/Random.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-}
+{-# LANGUAGE FlexibleInstances, TypeSynonymInstances, CPP #-}
 {-|
  Maintainer: Thomas.DuBuisson@gmail.com
  Stability: beta
@@ -38,6 +38,10 @@
 import Data.Bits (xor, setBit, shiftR, shiftL, (.&.))
 import Data.List (foldl')
 import System.IO.Unsafe(unsafeInterleaveIO)
+
+#if MIN_VERSION_tagged(0,2,0)
+import Data.Proxy
+#endif
 
 -- |many generators have these error conditions in common
 data GenError =
diff --git a/crypto-api.cabal b/crypto-api.cabal
--- a/crypto-api.cabal
+++ b/crypto-api.cabal
@@ -1,5 +1,5 @@
 name:           crypto-api
-version:        0.4
+version:        0.4.1
 license:        BSD3
 license-file:   LICENSE
 copyright:      Thomas DuBuisson <thomas.dubuisson@gmail.com>, Dominic Steinitz (see Data.LargeWord module)