diff --git a/lambdabot-core.cabal b/lambdabot-core.cabal
--- a/lambdabot-core.cabal
+++ b/lambdabot-core.cabal
@@ -1,5 +1,5 @@
 name:                   lambdabot-core
-version:                5.1.0.1
+version:                5.1.0.2
 
 license:                GPL
 license-file:           LICENSE
diff --git a/src/Lambdabot/Config.hs b/src/Lambdabot/Config.hs
--- a/src/Lambdabot/Config.hs
+++ b/src/Lambdabot/Config.hs
@@ -29,9 +29,9 @@
 import Data.Generics (everywhere, mkT)
 import Language.Haskell.TH
 
-data Config t where Config :: (Typeable1 k, GCompare k) => !(k t) -> t -> (t -> t -> t) -> Config t
+data Config t where Config :: (Typeable k, GCompare k) => !(k t) -> t -> (t -> t -> t) -> Config t
 
-cast1 :: (Typeable1 f, Typeable1 g) => f a -> Maybe (g a)
+cast1 :: (Typeable f, Typeable g) => f a -> Maybe (g a)
 cast1 = fmap runIdentity . gcast1 . Identity
 
 instance GEq Config where