diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+# 0.5.1 (2017-07-30)
+    * Fix a build issue with GHC 8.2.1
 # 0.5.0 (2017-07-30)
     This is a major release with lots of internal rewrites and new features:
     * Introduced monoidal layout builders like `Columns` for easier layout of
diff --git a/src/Graphics/UI/Threepenny/Editors.hs b/src/Graphics/UI/Threepenny/Editors.hs
--- a/src/Graphics/UI/Threepenny/Editors.hs
+++ b/src/Graphics/UI/Threepenny/Editors.hs
@@ -90,7 +90,7 @@
   type EditorWidget a = Layout
   -- | The editor factory
   editor :: EditorFactory a (EditorWidget a) a
-  default editor :: (Generic a, HasDatatypeInfo a, (All (All Editable `And` All Default) (Code a))) => EditorFactory a Layout a
+  default editor :: (Generic a, HasDatatypeInfo a, (All (All Editable `And` All Default) (Code a)), EditorWidget a ~ Layout) => EditorFactory a (EditorWidget a) a
   editor = editorGeneric
 
 -- | Conceal the widget type of some 'Editor'
diff --git a/threepenny-editors.cabal b/threepenny-editors.cabal
--- a/threepenny-editors.cabal
+++ b/threepenny-editors.cabal
@@ -3,7 +3,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           threepenny-editors
-version:        0.5.0
+version:        0.5.1
 synopsis:       Composable algebraic editors
 description:    This package provides a type class 'Editable' and combinators to
                 easily put together form-like editors for algebraic datatypes.