1 files changed, 1 insertions, 1 deletions
diff --git a/Hash.hs b/Hash.hs
index 8a33803..a76e0b4 100644
--- a/Hash.hs
+++ b/Hash.hs
@@ -84,7 +84,7 @@ instance Hashable [Hash] where
 	hash = hash . B.concat . map (val . hashValue)
 
 -- | Hash empty string for Nothing
-instance Hashable v => Hashable (Maybe v) where
+instance Hashable (Maybe Hash) where
 	hash Nothing = hash ()
 	hash (Just v) = hash v