diff --git a/Crypto/ConstructHash/MiyaguchiPreneel.hs b/Crypto/ConstructHash/MiyaguchiPreneel.hs
index 803d954..b4a126a 100644
--- a/Crypto/ConstructHash/MiyaguchiPreneel.hs
+++ b/Crypto/ConstructHash/MiyaguchiPreneel.hs
@@ -11,7 +11,7 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 module Crypto.ConstructHash.MiyaguchiPreneel
        ( mp, mp'
-       , MiyaguchiPreneel(..)
+       , MiyaguchiPreneel
        , cipherInit'
        ) where