diff --git a/src/Network/Minio.hs b/src/Network/Minio.hs
index 73cfaf0..5c816b0 100644
--- a/src/Network/Minio.hs
+++ b/src/Network/Minio.hs
@@ -22,7 +22,7 @@ import Network.Minio.Data as
   , ConnectInfo(..)
   )
 
-import System.FilePath (FilePath)
+-- import System.FilePath (FilePath)
 import qualified System.IO as IO
 import qualified Data.Conduit as C
 import qualified Control.Monad.Trans.Resource as R
diff --git a/src/Network/Minio/API.hs b/src/Network/Minio/API.hs
index edad4b8..82c3d6c 100644
--- a/src/Network/Minio/API.hs
+++ b/src/Network/Minio/API.hs
@@ -13,7 +13,6 @@ import qualified Network.HTTP.Types as HT
 import           Network.HTTP.Conduit (Response)
 import qualified Network.HTTP.Conduit as NC
 import           Network.HTTP.Types (Method, Header, Query)
-import qualified Data.ByteString.Lazy as LBS
 import qualified Data.Conduit as C
 import Data.Conduit.Binary (sourceHandleRange)
 
diff --git a/src/Network/Minio/Utils.hs b/src/Network/Minio/Utils.hs
index 1ff1d35..cbfb4d0 100644
--- a/src/Network/Minio/Utils.hs
+++ b/src/Network/Minio/Utils.hs
@@ -8,8 +8,6 @@ import           Network.HTTP.Conduit (Response)
 import qualified Data.Conduit as C
 import qualified Data.ByteString.Lazy as LBS
 import qualified Network.HTTP.Types as HT
-import Control.Monad.Trans.Except (withExceptT, ExceptT(..), withExcept)
-import Control.Monad.Base (MonadBase(..))
 import qualified Control.Exception.Lifted as ExL
 
 
@@ -17,9 +15,6 @@ import Lib.Prelude
 
 import Network.Minio.Data
 
--- tryIO :: (MonadIO m, MonadError MinioErr m) => IO a -> m a
--- tryIO act = either (throwError . MErrIO) return $ try act
-
 allocateReadFile :: (R.MonadResource m, MonadError MinioErr m)
                  => FilePath -> m (R.ReleaseKey, Handle)
 allocateReadFile fp = do
@@ -29,7 +24,7 @@ allocateReadFile fp = do
     openReadFile f = runExceptT $ tryIO $ IO.openBinaryFile f IO.ReadMode
     cleanup = either (const $ return ()) IO.hClose
 
-
+isSuccessStatus :: HT.Status -> Bool
 isSuccessStatus sts = let s = HT.statusCode sts
                       in (s >= 200 && s < 300)
 
@@ -47,11 +42,9 @@ httpLbs req mgr = do
     throwError $ MErrService $ LBS.toStrict $ NC.responseBody resp
   return resp
 
--- http :: (MonadError MinioErr m, R.MonadResourceBase m, R.MonadResource m)
---      => NC.Request -> NC.Manager
---      -> m (Response (C.ResumableSource m ByteString))
-http :: NC.Request -> NC.Manager
-     -> Minio (Response (C.ResumableSource Minio ByteString))
+http :: (MonadError MinioErr m, R.MonadResourceBase m, R.MonadResource m)
+     => NC.Request -> NC.Manager
+     -> m (Response (C.ResumableSource m ByteString))
 http req mgr = do
   respE <- ExL.try $ NC.http req mgr
   resp <- checkEither MErrHttp respE
diff --git a/src/Network/Minio/XmlParser.hs b/src/Network/Minio/XmlParser.hs
index 854f22c..9a56f4f 100644
--- a/src/Network/Minio/XmlParser.hs
+++ b/src/Network/Minio/XmlParser.hs
@@ -12,6 +12,7 @@ import           Lib.Prelude
 
 import Network.Minio.Data
 
+s3TimeFormat :: [Char]
 s3TimeFormat = iso8601DateFormat $ Just "%T%QZ"
 
 parseListBuckets :: (MonadError MinioErr m) => LByteString -> m [BucketInfo]