diff --git a/Data/Geo/GPX/Accessor/Accessor.hs b/Data/Geo/GPX/Accessor/Accessor.hs
--- a/Data/Geo/GPX/Accessor/Accessor.hs
+++ b/Data/Geo/GPX/Accessor/Accessor.hs
@@ -2,5 +2,7 @@
                                        using
                                      ) where
 
+import Control.Monad.Instances()
+
 using :: (a -> d) -> (c -> a -> b) -> (d -> c) -> a -> b
 using f g = flip (flip =<< (g .) . flip id . f)
diff --git a/GPX.cabal b/GPX.cabal
--- a/GPX.cabal
+++ b/GPX.cabal
@@ -1,5 +1,5 @@
 Name:                GPX
-Version:             0.4.4
+Version:             0.4.5
 License:             BSD3
 License-File:        LICENSE
 Synopsis:            Parse GPX files