diff --git a/src/Control.Monad.State.Async.purs b/src/Control.Monad.State.Async.purs
index 6488e16..dfdb1b2 100644
--- a/src/Control.Monad.State.Async.purs
+++ b/src/Control.Monad.State.Async.purs
@@ -289,7 +289,7 @@ instance (Parallel f m) => Parallel (AsyncStateT w s f) (AsyncStateT w s m) wher
   parallel a = wrap $ parallel $ unwrap a
   sequential a = wrap $ sequential $ unwrap a
 
-instance (MonadError e m, MonadKill e f m) => MonadKill e f (AsyncStateT w s m) where
+instance MonadKill e f m => MonadKill e f (AsyncStateT w s m) where
   kill e f = wrap $ kill e f
 
 instance (MonadBracket e f m) => MonadBracket e f (AsyncStateT w s m) where