diff --git a/flake.nix b/flake.nix
index 5fa2f95..5dcf999 100755
--- a/flake.nix
+++ b/flake.nix
@@ -404,6 +404,7 @@
             {
               home-manager.useGlobalPkgs = true;
               home-manager.useUserPackages = true;
+              home-manager.backupFileExtension = "backup";
               home-manager.users.matt = 
                 { ... }:
                 {