diff --git a/flake.nix b/flake.nix
index eb1377e8..43e52bc5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -108,6 +108,7 @@
           };
           useGlobalPkgs = true;
           useUserPackages = true;
+          backupFileExtension = "backup";
           users.${username} = {
             imports = [
               plasma-manager.homeManagerModules.plasma-manager