diff --git a/build.rs b/build.rs
index ac6a6d81e..dda3059a6 100644
--- a/build.rs
+++ b/build.rs
@@ -619,7 +619,7 @@ fn configure_cc(c: &mut cc::Build, target: &Target, include_dir: &Path) {
     // Allow cross-compiling without a target sysroot for these targets.
     //
     // poly1305_vec.c requires <emmintrin.h> which requires <stdlib.h>.
-    if (target.arch == "wasm32" && target.os == "unknown")
+    if (target.arch == "wasm32")
         || (target.os == "linux" && target.is_musl && target.arch != "x86_64")
     {
         if let Ok(compiler) = c.try_get_compiler() {