diff --git a/src/Data/Unfoldable/Restricted.hs b/src/Data/Unfoldable/Restricted.hs
--- a/src/Data/Unfoldable/Restricted.hs
+++ b/src/Data/Unfoldable/Restricted.hs
@@ -136,6 +136,9 @@
 
 class (Hashable a, Eq a) => Hashable' a
 
+instance (Hashable a, Eq a) => Hashable' a
+
+
 instance UnfoldableR (Hashable') HashSet.HashSet where
   unfoldRestrict fa = choose
     [ pure HashSet.empty
diff --git a/unfoldable-restricted.cabal b/unfoldable-restricted.cabal
--- a/unfoldable-restricted.cabal
+++ b/unfoldable-restricted.cabal
@@ -1,5 +1,5 @@
 Name:                   unfoldable-restricted
-Version:                0.0.2
+Version:                0.0.3
 Author:                 Athan Clark <athan.clark@gmail.com>
 Maintainer:             Athan Clark <athan.clark@gmail.com>
 License:                BSD3