diff --git a/nixos/home-manager.nix b/nixos/home-manager.nix
index 31ac611..0875089 100644
--- a/nixos/home-manager.nix
+++ b/nixos/home-manager.nix
@@ -2,6 +2,7 @@
   home-manager = {
     useGlobalPkgs = true;
     useUserPackages = true;
+    backupFileExtension = "hm-backup";
     extraSpecialArgs = { inherit inputs; };
   };
 }