diff --git a/haskellscript.cabal b/haskellscript.cabal
--- a/haskellscript.cabal
+++ b/haskellscript.cabal
@@ -1,5 +1,5 @@
 name:                   haskellscript
-version:                0.2.0
+version:                0.2.1
 synopsis:               Command line tool for running Haskell scripts with a hashbang.
 description:
   This tool provides the ability to script in a shell with Haskell (including dependencies) the same way that has been possible with bash scripts or Python.
diff --git a/src/HaskellScript.hs b/src/HaskellScript.hs
--- a/src/HaskellScript.hs
+++ b/src/HaskellScript.hs
@@ -7,6 +7,7 @@
 import Control.Monad.Trans.Either
 import Crypto.Hash
 import Data.Either.Combinators
+import Data.Monoid
 import Data.Traversable
 import qualified Data.List as L
 import System.Directory