diff --git a/lib/Servant/JuicyPixels.hs b/lib/Servant/JuicyPixels.hs
--- a/lib/Servant/JuicyPixels.hs
+++ b/lib/Servant/JuicyPixels.hs
@@ -8,6 +8,7 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE UndecidableInstances #-}
 
 module Servant.JuicyPixels where
 
diff --git a/servant-JuicyPixels.cabal b/servant-JuicyPixels.cabal
--- a/servant-JuicyPixels.cabal
+++ b/servant-JuicyPixels.cabal
@@ -1,5 +1,5 @@
 name:                servant-JuicyPixels
-version:             0.3.1.0
+version:             0.3.1.1
 homepage:            https://github.com/tvh/servant-JuicyPixels
 license:             BSD3
 license-file:        LICENSE