diff --git a/registry-hedgehog.cabal b/registry-hedgehog.cabal
--- a/registry-hedgehog.cabal
+++ b/registry-hedgehog.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 2bfe939d8ce493f2e69d9924c0319a069110da1a4cfad251f46bcd81ee5b25a0
+-- hash: 65c1280eeb35adad6cc554972b941d6413be6f40dd7875f98069e60a99462ac8
 
 name:           registry-hedgehog
-version:        0.7.2.0
+version:        0.8.0.0
 synopsis:       utilities to work with Hedgehog generators and `registry`
 description:    This library provides some functions to extract generators from a "Registry" and make stateful modifications of that Registry to precisely control the generation of data
 category:       Control
@@ -52,7 +52,7 @@
     , mmorph ==1.*
     , multimap ==1.*
     , protolude ==0.3.*
-    , registry >=0.2 && <0.4
+    , registry >=0.4 && <1
     , tasty ==1.*
     , tasty-discover >=2 && <5
     , tasty-hedgehog >=1.0 && <2.0
@@ -101,7 +101,7 @@
     , mmorph ==1.*
     , multimap ==1.*
     , protolude ==0.3.*
-    , registry >=0.2 && <0.4
+    , registry >=0.4 && <1
     , registry-hedgehog
     , tasty ==1.*
     , tasty-discover >=2 && <5
diff --git a/src/Data/Registry/Hedgehog.hs b/src/Data/Registry/Hedgehog.hs
--- a/src/Data/Registry/Hedgehog.hs
+++ b/src/Data/Registry/Hedgehog.hs
@@ -96,7 +96,7 @@
 
 -- | Specialize a generator in a given context
 specializeGen :: forall (a :: Type) b ins out. (Typeable a, Typeable b) => Gen b -> Registry ins out -> Registry ins out
-specializeGen = specialize @(Gen a) @(Gen b)
+specializeGen g = specialize @(Gen a) @(Gen b) (fun g)
 
 -- | Add a generator for a list of elements
 genListOf :: forall a. (Typeable a) => Typed (Gen a -> Gen [a])