diff --git a/flake.nix b/flake.nix
index f9ac3baf..cc35d089 100644
--- a/flake.nix
+++ b/flake.nix
@@ -49,13 +49,11 @@
         pkgs = import nixpkgs {system = "x86_64-linux";};
         modules = [./aly.nix];
         extraSpecialArgs = inputs;
-        backupFileExtension = "backup";
       };
       dustin = home-manager.lib.homeManagerConfiguration {
         pkgs = import nixpkgs {system = "x86_64-linux";};
         modules = [./dustin.nix];
         extraSpecialArgs = inputs;
-        backupFileExtension = "backup";
       };
     };