diff --git a/jsaddle.cabal b/jsaddle.cabal
--- a/jsaddle.cabal
+++ b/jsaddle.cabal
@@ -1,5 +1,5 @@
 name: jsaddle
-version: 0.3.0.0
+version: 0.3.0.1
 cabal-version: >=1.10
 build-type: Simple
 license: MIT
diff --git a/src/Language/Javascript/JSaddle/Object.hs b/src/Language/Javascript/JSaddle/Object.hs
--- a/src/Language/Javascript/JSaddle/Object.hs
+++ b/src/Language/Javascript/JSaddle/Object.hs
@@ -94,7 +94,7 @@
 import Language.Javascript.JSaddle.Types
        (JSPropertyNameArray, JSString, Object(..), MutableJSArray,
         JSVal, Index)
-import Foreign.C.Types (CSize(..), CULong(..))
+import Foreign.C.Types (CSize(..), CULong(..), CUInt(..), CULLong(..))
 #ifdef ghcjs_HOST_OS
 import GHCJS.Types (nullRef, jsval)
 import GHCJS.Foreign.Callback