diff --git a/flake.nix b/flake.nix
index 00192ac..b5225a0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,6 +18,7 @@
         {
           home-manager.useGlobalPkgs = true;
           home-manager.useUserPackages = true;
+          home-manager.backupFileExtension = "hm-bak";
           home-manager.users.chexit = import ./home.nix;
         }
       ];