diff --git a/src/Xeno/SAX.hs b/src/Xeno/SAX.hs
--- a/src/Xeno/SAX.hs
+++ b/src/Xeno/SAX.hs
@@ -20,6 +20,7 @@
 import qualified Data.ByteString.Char8 as S8
 import qualified Data.ByteString.Unsafe as SU
 import           Data.Functor.Identity
+import           Data.Monoid
 import           Data.Word
 import           Xeno.Types
 
diff --git a/xeno.cabal b/xeno.cabal
--- a/xeno.cabal
+++ b/xeno.cabal
@@ -1,5 +1,5 @@
 name: xeno
-version: 0.3.5
+version: 0.3.5.1
 synopsis: A fast event-based XML parser in pure Haskell
 description: A fast, low-memory use, event-based XML parser in pure Haskell.  
 build-type: Simple