diff --git a/src/Foundation/SiteLayout.hs b/src/Foundation/SiteLayout.hs
index 8b58cad65..a5dd80bee 100644
--- a/src/Foundation/SiteLayout.hs
+++ b/src/Foundation/SiteLayout.hs
@@ -44,8 +44,7 @@ data CourseFavouriteToggleButton
   | BtnCourseFavouriteToggleAutomatic
   | BtnCourseFavouriteToggleOff
   deriving (Eq, Ord, Read, Show, Enum, Bounded, Generic, Typeable)
-instance Universe CourseFavouriteToggleButton
-instance Finite CourseFavouriteToggleButton
+  deriving anyclass (Universe, Finite)
 
 nullaryPathPiece ''CourseFavouriteToggleButton $ camelToPathPiece' 4