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-rw-r--r--XMonad/Core.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/XMonad/Core.hs b/XMonad/Core.hs
index 05f2b9b..fc7040f 100644
--- a/XMonad/Core.hs
+++ b/XMonad/Core.hs
@@ -123,7 +123,7 @@ instance (Monoid a) => Monoid (X a) where
mappend = liftM2 mappend
type ManageHook = Query (Endo WindowSet)
-newtype Query a = Query (ReaderT Window X a) deriving (Functor, Monad, MonadReader Window)
+newtype Query a = Query (ReaderT Window X a) deriving (Functor, Monad, MonadReader Window, MonadIO)
runManageHook :: ManageHook -> Window -> X (WindowSet -> WindowSet)
runManageHook (Query m) w = appEndo <$> runReaderT m w