diff --git a/Math/FFT.hs b/Math/FFT.hs
--- a/Math/FFT.hs
+++ b/Math/FFT.hs
@@ -90,8 +90,8 @@
 
 module Math.FFT (
     -- * Data types
-    Sign,
-    Kind,
+    Sign(..),
+    Kind(..),
     -- * Planner flags
     -- ** Algorithm restriction flags
     destroyInput,
diff --git a/fft.cabal b/fft.cabal
--- a/fft.cabal
+++ b/fft.cabal
@@ -1,5 +1,5 @@
 name:                fft
-version:             0.1.2
+version:             0.1.3
 synopsis:            Bindings to the FFTW library.
 description:
                      Bindings to the FFTW library.