diff --git a/firmware/default.nix b/firmware/default.nix
index 226a502..2fd6a24 100644
--- a/firmware/default.nix
+++ b/firmware/default.nix
@@ -17,5 +17,6 @@ rustPlatform.buildRustPackage rec {
   installPhase = ''
     mkdir -p $out
     cp target/riscv32imc-unknown-none-elf/release/helloworld $out
+    ${binutils-riscv}/bin/riscv32-unknown-elf-objcopy -O binary target/riscv32imc-unknown-none-elf/release/helloworld $out/helloworld.bin
   '';
 }