diff --git a/flake.nix b/flake.nix
index 41dc254..79300fb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -138,6 +138,7 @@
               home-manager.useGlobalPkgs = true;
               home-manager.useUserPackages = true;
               home-manager.extraSpecialArgs = { inherit inputs; };
+              home-manager.backupFileExtension = "bck";
               home-manager.users.chris = import ./home/home.nix;
             }
           ];