diff --git a/dot_config/flake/flake.nix b/dot_config/flake/flake.nix
index d39b8ff..b8d1ca0 100644
--- a/dot_config/flake/flake.nix
+++ b/dot_config/flake/flake.nix
@@ -122,6 +122,7 @@
           home-manager.useGlobalPkgs = true;
           home-manager.useUserPackages = true;
 
+          home-manager.backupFileExtension = "bak";
           home-manager.extraSpecialArgs = {inherit inputs outputs nixosModules homeModules darwinModules;};
           home-manager.users."tyler.mayoff" = import ./machines/hinge/home.nix;
           users.users."tyler.mayoff".home = "/Users/tyler.mayoff";