diff --git a/Crypto/Cipher/ChaCha.hs b/Crypto/Cipher/ChaCha.hs
index cb4e007..6895390 100644
--- a/Crypto/Cipher/ChaCha.hs
+++ b/Crypto/Cipher/ChaCha.hs
@@ -59,7 +59,7 @@ initialize nbRounds key nonce
     | not (kLen `elem` [16,32])       = error "ChaCha: key length should be 128 or 256 bits"
     | not (nonceLen `elem` [8,12])    = error "ChaCha: nonce length should be 64 or 96 bits"
     | not (nbRounds `elem` [8,12,20]) = error "ChaCha: rounds should be 8, 12 or 20"
-    | otherwise = unsafePerformIO $ do
+    | otherwise = unsafeDoIO $ do
         stPtr <- createSecureMem 64 $ \stPtr ->
             withBytePtr nonce $ \noncePtr  ->
             withBytePtr key $ \keyPtr ->
diff --git a/Crypto/Cipher/RC4.hs b/Crypto/Cipher/RC4.hs
index bc80db1..1d5f85f 100644
--- a/Crypto/Cipher/RC4.hs
+++ b/Crypto/Cipher/RC4.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE ForeignFunctionInterface, CPP #-}
+{-# LANGUAGE ForeignFunctionInterface #-}
 -- |
 -- Module      : Crypto.Cipher.RC4
 -- License     : BSD-style
@@ -25,18 +25,12 @@ import Data.Byteable
 import Data.SecureMem
 import Foreign.Ptr
 import Foreign.ForeignPtr
-import System.IO.Unsafe
 import Data.ByteString (ByteString)
 import qualified Data.ByteString as B
 import qualified Data.ByteString.Internal as B
 
 ----------------------------------------------------------------------
-unsafeDoIO :: IO a -> a
-#if __GLASGOW_HASKELL__ > 704
-unsafeDoIO = unsafeDupablePerformIO
-#else
-unsafeDoIO = unsafePerformIO
-#endif
+import Crypto.Internal.Compat
 
 -- | The encryption state for RC4
 newtype State = State SecureMem
diff --git a/Crypto/Cipher/Salsa.hs b/Crypto/Cipher/Salsa.hs
index 4e6effc..da4c2bb 100644
--- a/Crypto/Cipher/Salsa.hs
+++ b/Crypto/Cipher/Salsa.hs
@@ -18,6 +18,7 @@ import Data.SecureMem
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Internal as B
 import qualified Data.ByteString as B
+import Crypto.Internal.Compat
 import Data.Byteable
 import Data.Word
 import Data.Bits (xor)
@@ -50,7 +51,7 @@ initialize nbRounds key nonce
     | not (kLen `elem` [16,32])       = error "Salsa: key length should be 128 or 256 bits"
     | not (nonceLen `elem` [8,12])    = error "Salsa: nonce length should be 64 or 96 bits"
     | not (nbRounds `elem` [8,12,20]) = error "Salsa: rounds should be 8, 12 or 20"
-    | otherwise = unsafePerformIO $ do
+    | otherwise = unsafeDoIO $ do
         stPtr <- createSecureMem 64 $ \stPtr ->
             withBytePtr nonce $ \noncePtr  ->
             withBytePtr key   $ \keyPtr ->