diff --git a/functor-combo.cabal b/functor-combo.cabal
--- a/functor-combo.cabal
+++ b/functor-combo.cabal
@@ -1,5 +1,5 @@
 Name:                functor-combo
-Version:             0.0.0
+Version:             0.0.1
 Cabal-Version:       >= 1.2
 Synopsis:            Functor combinators with tries & zippers
 Category:            Data
diff --git a/src/FunctorCombo/Functor.hs b/src/FunctorCombo/Functor.hs
--- a/src/FunctorCombo/Functor.hs
+++ b/src/FunctorCombo/Functor.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE TypeOperators, EmptyDataDecls, StandaloneDeriving #-}
+{-# LANGUAGE TypeOperators, EmptyDataDecls, StandaloneDeriving, DeriveFunctor #-}
 {-# OPTIONS_GHC -Wall #-}
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