diff --git a/Data/Conduit/ImageSize.hs b/Data/Conduit/ImageSize.hs
--- a/Data/Conduit/ImageSize.hs
+++ b/Data/Conduit/ImageSize.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RankNTypes #-}
 module Data.Conduit.ImageSize
     ( sinkImageSize
     , Size (..)
diff --git a/imagesize-conduit.cabal b/imagesize-conduit.cabal
--- a/imagesize-conduit.cabal
+++ b/imagesize-conduit.cabal
@@ -1,5 +1,5 @@
 Name:                imagesize-conduit
-Version:             1.0.0
+Version:             1.0.0.1
 Synopsis:            Determine the size of some common image formats.
 Description:         Currently supports PNG, GIF, and JPEG. This package provides a Sink that will consume the minimum number of bytes necessary to determine the image dimensions.
 License:             BSD3