diff --git a/shakers.cabal b/shakers.cabal
--- a/shakers.cabal
+++ b/shakers.cabal
@@ -1,5 +1,5 @@
 name:                  shakers
-version:               0.0.3
+version:               0.0.4
 synopsis:              Shake helpers.
 description:           Primitive helpers for Shake files.
 homepage:              https://github.com/swift-nav/shakers
@@ -19,6 +19,7 @@
   ghc-options:         -Wall
   build-depends:       base >= 4.8 && < 4.9
                      , basic-prelude
+                     , directory
                      , shake
 
 executable shake-shakers