diff --git a/pkgs/tools/nix/nixos-option/default.nix b/pkgs/tools/nix/nixos-option/default.nix
index 37018ac25a0b..8c8b26e9ad47 100644
--- a/pkgs/tools/nix/nixos-option/default.nix
+++ b/pkgs/tools/nix/nixos-option/default.nix
@@ -10,7 +10,8 @@
 stdenv.mkDerivation {
   name = "nixos-option";
 
-  src = ./.;
+  src = ./src;
+
   postInstall = ''
     installManPage ${./nixos-option.8}
   '';
diff --git a/pkgs/tools/nix/nixos-option/CMakeLists.txt b/pkgs/tools/nix/nixos-option/src/CMakeLists.txt
similarity index 100%
rename from pkgs/tools/nix/nixos-option/CMakeLists.txt
rename to pkgs/tools/nix/nixos-option/src/CMakeLists.txt
diff --git a/pkgs/tools/nix/nixos-option/libnix-copy-paste.cc b/pkgs/tools/nix/nixos-option/src/libnix-copy-paste.cc
similarity index 100%
rename from pkgs/tools/nix/nixos-option/libnix-copy-paste.cc
rename to pkgs/tools/nix/nixos-option/src/libnix-copy-paste.cc
diff --git a/pkgs/tools/nix/nixos-option/libnix-copy-paste.hh b/pkgs/tools/nix/nixos-option/src/libnix-copy-paste.hh
similarity index 100%
rename from pkgs/tools/nix/nixos-option/libnix-copy-paste.hh
rename to pkgs/tools/nix/nixos-option/src/libnix-copy-paste.hh
diff --git a/pkgs/tools/nix/nixos-option/nixos-option.cc b/pkgs/tools/nix/nixos-option/src/nixos-option.cc
similarity index 100%
rename from pkgs/tools/nix/nixos-option/nixos-option.cc
rename to pkgs/tools/nix/nixos-option/src/nixos-option.cc