diff --git a/mirrord/cli/build.rs b/mirrord/cli/build.rs
index dfbaa241ff8..e4d6877f10a 100644
--- a/mirrord/cli/build.rs
+++ b/mirrord/cli/build.rs
@@ -10,8 +10,9 @@ fn main() {
         );
     };
 
-    #[cfg(all(target_os = "macos", target_arch = "aarch64"))]
-    if std::env::var("MIRRORD_LAYER_FILE_MACOS_ARM64").is_err() {
+    if std::env::var("MIRRORD_LAYER_FILE_MACOS_ARM64").is_err()
+        && std::env::var("CARGO_CFG_TARGET_ARCH").is_ok_and(|t| t.eq("aarch64"))
+    {
         println!("cargo::warning=No environment variable 'MIRRORD_LAYER_FILE_MACOS_ARM64' found - it should contain the path to the mirrord layer compiled for the `aarch64-apple-darwin` target");
         exit(1);
     };