diff --git a/Crypto/Hash/Types.hs b/Crypto/Hash/Types.hs
index 165a3c0..53c6791 100644
--- a/Crypto/Hash/Types.hs
+++ b/Crypto/Hash/Types.hs
@@ -51,7 +51,7 @@ newtype Context a = Context Bytes
 
 -- | Represent a digest for a given hash algorithm.
 newtype Digest a = Digest Bytes
-    deriving (Eq,ByteArrayAccess,NFData)
+    deriving (Eq,Ord,ByteArrayAccess,NFData)
 
 instance Show (Digest a) where
     show (Digest bs) = show (B.convertToBase B.Base16 bs :: Bytes)