diff --git a/hash.cabal b/hash.cabal
--- a/hash.cabal
+++ b/hash.cabal
@@ -1,6 +1,6 @@
 name:          hash
 category:      Data, Hash
-version:       0.1.1
+version:       0.1.2
 license:       BSD3
 cabal-version: >= 1.8
 license-file:  LICENSE
diff --git a/src/Data/Hash/CRC32.hs b/src/Data/Hash/CRC32.hs
--- a/src/Data/Hash/CRC32.hs
+++ b/src/Data/Hash/CRC32.hs
@@ -38,7 +38,7 @@
   def = CRC32 0xffffffff;
   {-# INLINE def #-}
 
-instance (Bifunctor p, Profunctor p, Functor f) => Snoc p f CRC32 CRC32 Word8 Word8 where
+instance (Reviewable p, Functor f) => Snoc p f CRC32 CRC32 Word8 Word8 where
   _Snoc = unto $ \(CRC32 h, w) -> CRC32 (shiftL h 8 `xor` lut w)
   {-# INLINE _Snoc #-}