diff --git a/tests/Benchmarks/ChameneosRedux/MVarList.hs b/tests/Benchmarks/ChameneosRedux/MVarList.hs
index e738bf5e62c0..60c8bc61bcce 100644
--- a/tests/Benchmarks/ChameneosRedux/MVarList.hs
+++ b/tests/Benchmarks/ChameneosRedux/MVarList.hs
@@ -59,7 +59,7 @@ import GHC.IORef
 --     x:tl -> (Queue tl back, Just x)
 
 -- NOTE KC: Even a list seems to work just as well as a queue.
-newtype Queue a = Queue [a]
+data Queue a = Queue [a]
 
 _INL_(emptyQueue)
 emptyQueue :: Queue a
diff --git a/tests/Benchmarks/ChameneosRedux/Makefile b/tests/Benchmarks/ChameneosRedux/Makefile
index 3601228df1e2..267677a9df9b 100644
--- a/tests/Benchmarks/ChameneosRedux/Makefile
+++ b/tests/Benchmarks/ChameneosRedux/Makefile
@@ -5,7 +5,7 @@ include ../../config.mk
 TOP := ../../../
 GHC_OPTS_EXTRA=-O2 -threaded -XBangPatterns -XCPP -XGeneralizedNewtypeDeriving -funbox-strict-fields -optc-O3
 
-PROFILE_FLAGS := -DPROFILE_ENABLED -prof -auto-all -fprof-auto
+PROFILE_FLAGS := -DPROFILE_ENABLED -prof -fprof-auto -auto -auto-all
 
 #Uncomment the following line to enable profiled compilation
 #GHC_OPTS_EXTRA += $(PROFILE_FLAGS)
diff --git a/tests/Benchmarks/Sieve/sieve-lwc.hs b/tests/Benchmarks/Sieve/sieve-lwc.hs
index 293575239631..bf8ccae17d9d 100644
--- a/tests/Benchmarks/Sieve/sieve-lwc.hs
+++ b/tests/Benchmarks/Sieve/sieve-lwc.hs
@@ -18,9 +18,8 @@ generate mOut = mapM_ (putMVar mOut) [2..]
 -- Take a value from mIn, divide it by a prime, if the remainder is not 0, put the value in mOut.
 primeFilter :: MVar Int -> MVar Int -> Int -> IO ()
 primeFilter mIn mOut prime = do
-  hole <- newIORef 0
   forever $ do
-    i <- takeMVarWithHole mIn hole
+    i <- takeMVar mIn
     when (i `mod` prime /= 0) (putMVar mOut i)
 
 -- Take the first commandline argument and call it numArg.
@@ -34,15 +33,14 @@ main = do
   mIn <- newEmptyMVar
   forkIO $ generate mIn
   out <- replicateM (read numArg) newEmptyMVar
-  hole <- newIORef 0
-  foldM_ (linkFilter hole) mIn out
+  foldM_ linkFilter mIn out
 
 -- Take a value from mIn, and call it prime. Then show that prime. Make a new thread that
 -- runs primeFilter with mIn, mOut and the prime. When this function is used as a fold
 -- function, mOut becomes the mIn of the next iteration.
-linkFilter :: IORef Int -> MVar Int -> MVar Int -> IO (MVar Int)
-linkFilter hole mIn mOut = do
-  prime <- takeMVarWithHole mIn hole
+linkFilter :: MVar Int -> MVar Int -> IO (MVar Int)
+linkFilter mIn mOut = do
+  prime <- takeMVar mIn
   putStrLn $ show prime
   forkIO $ primeFilter mIn mOut prime
   return mOut