diff --git a/hosts/rigel/default.nix b/hosts/rigel/default.nix
index 6db863c..f07e6fe 100644
--- a/hosts/rigel/default.nix
+++ b/hosts/rigel/default.nix
@@ -37,6 +37,7 @@
     shell = "${pkgs.zsh}/bin/zsh";
   };
 
+  environment.etcBackupExtension = ".backup";
   environment.motd = '''';
   environment.packages = with pkgs; [
     nano