diff --git a/ConcurrentUtils.cabal b/ConcurrentUtils.cabal
--- a/ConcurrentUtils.cabal
+++ b/ConcurrentUtils.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                ConcurrentUtils
-version:             0.4.0.0
+version:             0.4.1.0
 synopsis:            Concurrent utilities
 -- description:         
 homepage:            http://alkalisoftware.net
@@ -16,6 +16,6 @@
 cabal-version:       >=1.8
 
 library
-  exposed-modules:     Control.CUtils.Split, Control.CUtils.Processes, Control.CUtils.NetChan, Control.CUtils.FChan, Control.CUtils.Deadlock, Control.CUtils.DataParallel, Control.CUtils.Conc, Control.CUtils.Channel, Control.CUtils.AList
-  -- other-modules:       
-  build-depends:       base >=2 && <=5, process, network >=2.4, bytestring, binary, containers, array, parallel
+  exposed-modules:     Control.CUtils.Processes, Control.CUtils.NetChan, Control.CUtils.FChan, Control.CUtils.Deadlock, Control.CUtils.DataParallel, Control.CUtils.Conc, Control.CUtils.Channel, Control.CUtils.AList
+  other-modules:       Control.CUtils.Split   
+  build-depends:       base >=4 && <=5, process, network >=2.4, bytestring, binary, containers, array, parallel
diff --git a/Control/CUtils/Channel.hs b/Control/CUtils/Channel.hs
--- a/Control/CUtils/Channel.hs
+++ b/Control/CUtils/Channel.hs
@@ -3,7 +3,7 @@
 -- | A lock-free channel (queue) data structure.
 module Control.CUtils.Channel (Channel, newChannel, writeChannel, readChannel) where
 
-import Control.Concurrent.SampleVar
+import Control.Concurrent.MVar
 import Control.Monad
 import Data.IORef
 import Data.Bits
@@ -22,8 +22,8 @@
 	(IORef Word32){-filled-}
 	(IORef Word32){-maybe empty-}
 	(IORef Word32){-empty-}
-	(SampleVar ()){-full lock-}
-	(SampleVar ()){-empty lock-}
+	(MVar ()){-full lock-}
+	(MVar ()){-empty lock-}
 
 -- | Create a channel with a buffer at least as big as 'buffer'.
 newChannel :: (MArray a t IO) => Word32 -> IO (Channel a t)
@@ -41,8 +41,8 @@
 	e <- newIORef 0
 
 	-- Create locks
-	fl <- newSampleVar ()
-	el <- newEmptySampleVar
+	fl <- newMVar ()
+	el <- newEmptyMVar
 
 	return (Channel buffer' a mf f me e fl el)
 
@@ -54,12 +54,12 @@
 		yN <- readIORef y
 		if yN + off <= mXN then do
 				mYN <- readIORef my
-				when (yN == mYN) $ readSampleVar lx
+				when (yN == mYN) $ takeMVar lx
 				spin
 			else do
 				val <- f a (mXN `mod` buffer)
 				increment x
-				writeSampleVar ly ()
+				tryPutMVar ly ()
 				return val
 	spin