diff --git a/overlay.nix b/overlay.nix
index 628a773..fea2755 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -31,16 +31,6 @@ final: prev:
     filesToInstall = ["u-boot.bin" "u-boot"];
   };
 
-  # To cross compile for riscv64, we need to populate this env variable, not
-  # NIX_CFLAGS_COMPILE, otherwise we affect the packages for x86.
-  stdenv = if prev.stdenv.buildPlatform != prev.stdenv.hostPlatform
-  then
-    prev.stdenvAdapters.addAttrsToDerivation {
-      NIX_CFLAGS_COMPILE_riscv64_unknown_linux_gnu = "-march=rv64g";
-    } prev.stdenv
-  else
-    prev.stdenv;
-
   opensbi-uboot = prev.opensbi.overrideAttrs (old: {
     makeFlags = old.makeFlags ++ [
         # Build OpenSBI without compressed instructions