diff --git a/binary-parser.cabal b/binary-parser.cabal
--- a/binary-parser.cabal
+++ b/binary-parser.cabal
@@ -1,7 +1,7 @@
 name:
   binary-parser
 version:
-  0.5
+  0.5.0.1
 synopsis:
   A highly-efficient but limited parser API specialised for bytestrings
 category:
diff --git a/library/BinaryParser/Prelude.hs b/library/BinaryParser/Prelude.hs
--- a/library/BinaryParser/Prelude.hs
+++ b/library/BinaryParser/Prelude.hs
@@ -1,10 +1,6 @@
 module BinaryParser.Prelude
 ( 
   module Exports,
-  LazyByteString,
-  ByteStringBuilder,
-  LazyText,
-  TextBuilder,
   mapLeft,
   joinMap,
 )
@@ -29,27 +25,7 @@
 -------------------------
 import Data.Text as Exports (Text)
 
--- custom
--------------------------
-import qualified Data.ByteString.Lazy
-import qualified Data.ByteString.Builder
-import qualified Data.Text.Lazy
-import qualified Data.Text.Lazy.Builder
 
-
-type LazyByteString =
-  Data.ByteString.Lazy.ByteString
-
-type ByteStringBuilder =
-  Data.ByteString.Builder.Builder
-
-type LazyText =
-  Data.Text.Lazy.Text
-
-type TextBuilder =
-  Data.Text.Lazy.Builder.Builder
-
-
 {-# INLINE mapLeft #-}
 mapLeft :: (a -> b) -> Either a x -> Either b x
 mapLeft f =
@@ -57,4 +33,4 @@
 
 joinMap :: Monad m => (a -> m b) -> m a -> m b
 joinMap f =
-  join . fmap f
+  join . liftM f