diff --git a/wasm.nix b/wasm.nix
index d924c10..b659efd 100644
--- a/wasm.nix
+++ b/wasm.nix
@@ -1,16 +1,17 @@
-{ stdenv, clang, wasilibc }:
+{ stdenv, clang, pkgsCross }:
 
 stdenv.mkDerivation {
   name = "triangle";
   src = ./.;
 
-  nativeBuildInputs = [ clang wasilibc ];
+  nativeBuildInputs = [ clang ];
   
 
   configurePhase = "";
   buildPhase = ''
     clang \
       --target=wasm32-unknown-wasi \
+      --sysroot ${pkgsCross.wasi32.wasilibc} \
       -O3 \
       -flto \
       -nostdlib \