diff --git a/foldl-transduce-attoparsec.cabal b/foldl-transduce-attoparsec.cabal
--- a/foldl-transduce-attoparsec.cabal
+++ b/foldl-transduce-attoparsec.cabal
@@ -1,5 +1,5 @@
 Name: foldl-transduce-attoparsec
-Version: 0.1.0.0
+Version: 0.1.0.1
 Cabal-Version: >=1.8.0.2
 Build-Type: Simple
 License: BSD3
@@ -28,7 +28,7 @@
         text          >= 0.11.2.0 && < 1.3 ,
         foldl-transduce == 0.4.*,
         attoparsec == 0.13.*,
-        transformers  >= 0.2.0.0  && < 0.5 ,
+        transformers  >= 0.4.0.0  && < 0.5 ,
         monoid-subclasses == 0.4.*
     Exposed-Modules:
         Control.Foldl.Transduce.Attoparsec
diff --git a/src/Control/Foldl/Transduce/Attoparsec.hs b/src/Control/Foldl/Transduce/Attoparsec.hs
--- a/src/Control/Foldl/Transduce/Attoparsec.hs
+++ b/src/Control/Foldl/Transduce/Attoparsec.hs
@@ -10,6 +10,7 @@
 import Data.Attoparsec.Types
 import Data.Attoparsec.ByteString
 import Data.Attoparsec.Text
+import Data.Monoid
 import qualified Data.Monoid.Null as MN
 import qualified Data.Monoid.Factorial as MF
 import Control.Monad.Trans.Except