diff --git a/hosts/dnsc-air/default.nix b/hosts/dnsc-air/default.nix
index 8844504..e5795bb 100644
--- a/hosts/dnsc-air/default.nix
+++ b/hosts/dnsc-air/default.nix
@@ -166,6 +166,7 @@
   home-manager = {
     extraSpecialArgs = { inherit inputs outputs; };
     useGlobalPkgs = true;
+    backupFileExtension = "backup";
     users = {
       dennis = import ../../home/darwin.nix;
     };