1 files changed, 4 insertions, 5 deletions

diff --git a/src/Control/Concurrent/Lifted/Instrument.hs b/src/Control/Concurrent/Lifted/Instrument.hs
index 41814d98..5b3237cc 100644
--- a/src/Control/Concurrent/Lifted/Instrument.hs
+++ b/src/Control/Concurrent/Lifted/Instrument.hs
@@ -47,16 +47,15 @@ forkIO :: IO () -> IO ThreadId
 forkIO = fork
 {-# INLINE forkIO #-}
 
-forkOS :: (MonadBaseControl IO m, MonadIO m) => m () -> m ThreadId
+forkOS :: MonadBaseControl IO m => m () -> m ThreadId
 forkOS = instrumented Raw.forkOS
 {-# INLINE forkOS #-}
 
-fork :: (MonadBaseControl IO m, MonadIO m) => m () -> m ThreadId
+fork :: MonadBaseControl IO m => m () -> m ThreadId
 fork = instrumented Raw.fork
 {-# INLINE fork #-}
 
-instrumented :: ( MonadBaseControl IO m
-                , MonadIO m) =>
+instrumented :: MonadBaseControl IO m =>
                 (m () -> m ThreadId) -> m () -> m ThreadId
 instrumented rawFork action = do
     t <- rawFork $ do
@@ -66,7 +65,7 @@ instrumented rawFork action = do
                  (return ())
             $ do catch action $ \e -> case fromException e of
                     Just ThreadKilled -> return ()
-                    Nothing           -> liftIO $ do
+                    Nothing           -> liftBase $ do
                         g <- takeMVar globals
                         let l = concat [ show e
                                        , " ("