diff --git a/modules/rename.nix b/modules/rename.nix
index 2d5a938c628..ebad3821270 100644
--- a/modules/rename.nix
+++ b/modules/rename.nix
@@ -27,7 +27,13 @@ let
 
   zipModules = list: with pkgs.lib;
     zip (n: v:
-      if tail v != [] then zipModules v else head v
+      if tail v != [] then
+        if n == "_type" then builtins.trace "Merge _type" (head v)
+        else if n == "extraConfigs" then builtins.trace "Merge extraConfigs" (concatLists v)
+        else if n == "description" || n == "apply" then
+          abort "Cannot rename an option to multiple options."
+        else zipModules v
+      else head v
     ) list;
 
   rename = statusTemplate: from: to: with pkgs.lib;