diff --git a/winch/codegen/build.rs b/winch/codegen/build.rs
index 9f18db48a0..378ac51732 100644
--- a/winch/codegen/build.rs
+++ b/winch/codegen/build.rs
@@ -3,10 +3,14 @@ fn main() {
         return;
     }
 
-    if cfg!(target_arch = "x86_64") {
+    let arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
+
+    if arch == "x86_64" {
         println!("cargo:rustc-cfg=feature=\"x64\"");
-    } else if cfg!(target_arch = "aarch64") {
+    } else if arch == "aarch64" {
         println!("cargo:rustc-cfg=feature=\"arm64\"");
+    } else {
+        println!("cargo:rustc-cfg=feature=\"{arch}\"");
     }
     println!("cargo:rerun-if-changed=build.rs");
 }