diff --git a/nixos/configs/dotfiles/default.nix b/nixos/configs/dotfiles/default.nix
index d775610..b81b132 100644
--- a/nixos/configs/dotfiles/default.nix
+++ b/nixos/configs/dotfiles/default.nix
@@ -5,6 +5,7 @@
 {
   home-manager.useGlobalPkgs = true;
   home-manager.useUserPackages = true;
+  home-manager.backupFileExtension = "bak";
 
   home-manager.users.deprekated = callHm ./hm.nix;