diff --git a/tests/Benchmarks/ChameneosRedux/FairShare.hs b/tests/Benchmarks/ChameneosRedux/FairShare.hs
index 2c39e393d254..e9b2a0a85c2c 100644
--- a/tests/Benchmarks/ChameneosRedux/FairShare.hs
+++ b/tests/Benchmarks/ChameneosRedux/FairShare.hs
@@ -221,7 +221,8 @@ fork task on kind = do
     sc <- getSCont;
     setSContSwitchReason sc Completed;
     switchToNext <- getYieldControlAction;
-    switchToNext
+    switchToNext;
+    return ()
   }
   let makeSCont = case kind of
                     Bound -> newBoundSCont
diff --git a/tests/Benchmarks/ChameneosRedux/Makefile b/tests/Benchmarks/ChameneosRedux/Makefile
index 03f659ecf9fa..677ca4fc9dcd 100644
--- a/tests/Benchmarks/ChameneosRedux/Makefile
+++ b/tests/Benchmarks/ChameneosRedux/Makefile
@@ -4,7 +4,7 @@ include ../../config.mk
 
 TOP := ../../../
 EXTRA_LIBS=/scratch/chandras/install
-GHC_OPTS_EXTRA=-O2 -threaded -XDeriveDataTypeable -XBangPatterns -XCPP -XGeneralizedNewtypeDeriving -funbox-strict-fields -optc-O3 -ipqueue-1.2.1 -debug
+GHC_OPTS_EXTRA=-O2 -threaded -XDeriveDataTypeable -XBangPatterns -XCPP -XGeneralizedNewtypeDeriving -funbox-strict-fields -ipqueue-1.2.1 -optc-O3
 
 PROFILE_FLAGS := -DPROFILE_ENABLED -prof -fprof-auto -auto -auto-all
 
diff --git a/tests/Benchmarks/ChameneosRedux/chameneos-redux-lwc.hs b/tests/Benchmarks/ChameneosRedux/chameneos-redux-lwc.hs
index 3d53ddc39c8d..415e6fa2290b 100644
--- a/tests/Benchmarks/ChameneosRedux/chameneos-redux-lwc.hs
+++ b/tests/Benchmarks/ChameneosRedux/chameneos-redux-lwc.hs
@@ -36,6 +36,7 @@ complement !a !b = case a of
     B -> case b of R -> Y; B -> B; _ -> R
     R -> case b of B -> Y; R -> R; _ -> B
     Y -> case b of B -> R; Y -> Y; _ -> B
+    _ -> error "complement: impossible"
 
 type Chameneous = Ptr Color
 data MP = Nobody !Int | Somebody !Int !Chameneous !(MVar Chameneous)
@@ -94,11 +95,11 @@ initSched = do
   replicateM_ (n-1) newCapability
 
 main = do
-    initSched
     putStrLn . map toLower . unlines $
         [unwords [show a, "+", show b, "->", show $ complement a b]
             | a <- [B..Y], b <- [B..Y]]
 
     n <- readIO . head =<< getArgs
+    initSched
     actions <- zipWithM (run n) [0..] [[B..Y],[B,R,Y,R,Y,B,R,Y,R,B]]
     sequence_ actions