diff --git a/src/Patch.hs b/src/Patch.hs
index 7910197d9..87bab6aca 100644
--- a/src/Patch.hs
+++ b/src/Patch.hs
@@ -26,7 +26,7 @@ data Patch a
   = Replace a a
   | Insert a
   | Delete a
-  deriving (Eq, Foldable, Functor, Generic, Ord, Show, Traversable, NFData)
+  deriving (Eq, Foldable, Functor, Generic, Generic1, Ord, Show, Traversable, NFData)
 
 
 -- DSL