diff --git a/pkgs/by-name/ve/veilid/package.nix b/pkgs/by-name/ve/veilid/package.nix
index 3e6f80b4e028..42da59a32f08 100644
--- a/pkgs/by-name/ve/veilid/package.nix
+++ b/pkgs/by-name/ve/veilid/package.nix
@@ -33,7 +33,7 @@ rustPlatform.buildRustPackage rec {
     "--workspace"
   ];
 
-  RUSTFLAGS = "--cfg tokio_unstable";
+  env.RUSTFLAGS = "--cfg tokio_unstable";
 
   doCheck = false;