diff --git a/pkgs/tools/nix/nixos-option/default.nix b/pkgs/tools/nix/nixos-option/default.nix
index 7cca1eb7b38d..37018ac25a0b 100644
--- a/pkgs/tools/nix/nixos-option/default.nix
+++ b/pkgs/tools/nix/nixos-option/default.nix
@@ -31,6 +31,7 @@ stdenv.mkDerivation {
 
   meta = with lib; {
     license = licenses.lgpl2Plus;
+    mainProgram = "nixos-option";
     maintainers = with maintainers; [ ];
     inherit (nix.meta) platforms;
   };