diff --git a/nixos/nix.nix b/nixos/nix.nix
index d56a0fbd..23d508c8 100644
--- a/nixos/nix.nix
+++ b/nixos/nix.nix
@@ -18,6 +18,7 @@
     };
     home-manager.useGlobalPkgs = true;
     home-manager.useUserPackages = true;
+    home-manager.backupFileExtension = "backup";
 
     nix = rec {
       extraOptions = ''