diff --git a/src/Data/Mergeable/Generic.hs b/src/Data/Mergeable/Generic.hs
index 3d7bd0649..a9bb83d89 100644
--- a/src/Data/Mergeable/Generic.hs
+++ b/src/Data/Mergeable/Generic.hs
@@ -43,4 +43,4 @@ instance GMergeable [] where
 
 instance GMergeable Maybe where
   gmerge f (Just a) = Just <$> f a
-  gmerge _ Nothing = empty
+  gmerge _ Nothing = pure empty