diff --git a/flake.nix b/flake.nix
index fb72dce..a50cf76 100644
--- a/flake.nix
+++ b/flake.nix
@@ -47,6 +47,8 @@
           modules = modules ++ [
             {
               nixpkgs.crossSystem = {
+                gcc.arch = "rv64gv";
+                gcc.tune = "rv64gv";
                 system = "riscv64-linux";
               };
             }