diff --git a/pkgs/tools/nix/nixos-option/default.nix b/pkgs/tools/nix/nixos-option/default.nix
index d6cfc630d6e3..37018ac25a0b 100644
--- a/pkgs/tools/nix/nixos-option/default.nix
+++ b/pkgs/tools/nix/nixos-option/default.nix
@@ -10,10 +10,7 @@
 stdenv.mkDerivation {
   name = "nixos-option";
 
-  src = lib.fileset.toSource {
-    root = ./.;
-    fileset = lib.fileset.fileFilter (file: file.name != "default.nix") ./.;
-  };
+  src = ./.;
   postInstall = ''
     installManPage ${./nixos-option.8}
   '';