diff --git a/src/Database/Redis/Sentinel.hs b/src/Database/Redis/Sentinel.hs
index d3a4f0d8..8c15b3c5 100644
--- a/src/Database/Redis/Sentinel.hs
+++ b/src/Database/Redis/Sentinel.hs
@@ -46,6 +46,7 @@ import           Control.Exception     (Exception, IOException, evaluate, throwI
 import           Control.Monad
 import           Control.Monad.Catch   (Handler (..), MonadCatch, catches, throwM)
 import           Control.Monad.Except
+import           Control.Monad.IO.Class(MonadIO(liftIO))
 import           Data.ByteString       (ByteString)
 import qualified Data.ByteString       as BS
 import qualified Data.ByteString.Char8 as BS8