diff --git a/flake.nix b/flake.nix
index f54827b..6f16259 100644
--- a/flake.nix
+++ b/flake.nix
@@ -24,6 +24,7 @@
           {
             home-manager.useGlobalPkgs = true;
             home-manager.useUserPackages = true;
+            home-manager.backupFileExtension = "hm-bak";
             home-manager.users.ltadeu6 = import ./home/ltadeu6.nix;
           }
         ];