diff --git a/pkgs/by-name/cl/clash-rs/package.nix b/pkgs/by-name/cl/clash-rs/package.nix
index caa92e288d37..d9eee202ef37 100644
--- a/pkgs/by-name/cl/clash-rs/package.nix
+++ b/pkgs/by-name/cl/clash-rs/package.nix
@@ -35,8 +35,6 @@ rustPlatform.buildRustPackage (finalAttrs: {
   env = {
     # requires features: sync_unsafe_cell, unbounded_shifts, let_chains, ip
     RUSTC_BOOTSTRAP = 1;
-    RUSTFLAGS = "--cfg tokio_unstable -A stable_features";
-    NIX_CFLAGS_COMPILE = "-Wno-error";
   };
 
   buildFeatures = [ "plus" ];