diff --git a/pkgs/development/tools/knightos/mkrom/default.nix b/pkgs/development/tools/knightos/mkrom/default.nix
index 21caa5b8b32a..af40a1a95ef6 100644
--- a/pkgs/development/tools/knightos/mkrom/default.nix
+++ b/pkgs/development/tools/knightos/mkrom/default.nix
@@ -23,5 +23,6 @@ stdenv.mkDerivation rec {
     license     = licenses.mit;
     maintainers = with maintainers; [ siraben ];
     platforms   = platforms.all;
+    mainProgram = "remkrom";
   };
 }