diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 Brick changelog
 ---------------
 
+0.6.4
+-----
+
+Bug fixes:
+ * Add missing Functor instance for Next type (thanks Markus Hauck)
+
 0.6.3
 -----
 
diff --git a/brick.cabal b/brick.cabal
--- a/brick.cabal
+++ b/brick.cabal
@@ -1,5 +1,5 @@
 name:                brick
-version:             0.6.3
+version:             0.6.4
 synopsis:            A declarative terminal user interface library
 description:
   Write terminal applications painlessly with 'brick'! You write an
diff --git a/src/Brick/Types/Internal.hs b/src/Brick/Types/Internal.hs
--- a/src/Brick/Types/Internal.hs
+++ b/src/Brick/Types/Internal.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 module Brick.Types.Internal
@@ -97,6 +98,7 @@
 data Next a = Continue a
             | SuspendAndResume (IO a)
             | Halt a
+            deriving Functor
 
 -- | Scrolling direction.
 data Direction = Up