diff --git a/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix b/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
index 5e97d14d7aca..0e68a1108319 100644
--- a/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
+++ b/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
@@ -44,14 +44,15 @@ rustPlatform.buildRustPackage rec {
   # https://github.com/cloud-hypervisor/rust-hypervisor-firmware/issues/249
   auditable = false;
 
-  RUSTC_BOOTSTRAP = 1;
+  env = {
+    RUSTC_BOOTSTRAP = 1;
+    RUSTFLAGS = "-C linker=lld -C linker-flavor=ld.lld";
+  };
 
   nativeBuildInputs = [
     lld
   ];
 
-  RUSTFLAGS = "-C linker=lld -C linker-flavor=ld.lld";
-
   # Tests don't work for `no_std`. See https://os.phil-opp.com/testing/
   doCheck = false;