diff --git a/Rsconscript b/Rsconscript
index 010ae00..1a9aba8 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -92,7 +92,9 @@ hello_env = env "hello", use: %w[ldc2 x86_64-w64-mingw32-gcc] do |env|
   env["sources"] = glob("src/hello/**/*.d")
   env["sources"] += glob("uefi-d/source/**/*.d")
   env.HulkBinObj("^/hulk_bin.S", hulk_env.expand("^/hulk.bin"))
-  env["sources"] << "^/hulk_bin.S"
+  env.Object("^/hulk_bin.o", "^/hulk_bin.S")
+  env.depends("^/hulk_bin.o", hulk_env.expand("^/hulk.bin"))
+  env["sources"] << "^/hulk_bin.o"
   env["DFLAGS"] += %w[-mtriple=x86_64-unknown-windows-coff --betterC -release -O3 --wi --enable-cross-module-inlining]
   env["D_IMPORT_PATH"] += %w[src/hello src/hulk uefi-d/source src/common]
   env["LD"] = "x86_64-w64-mingw32-gcc"