diff --git a/build.rs b/build.rs
index 719c15e..7328564 100644
--- a/build.rs
+++ b/build.rs
@@ -90,7 +90,10 @@ fn fix_xwin_lib_case() -> Result<(), Box<dyn std::error::Error>> {
         .and_then(|p| p.parent())
         .ok_or(Error::msg("cannot determine cargo-xwin base dir"))?;
 
-    let xwin_sdk_lib = cargo_xwin_base.join("xwin/sdk/lib/um/x86_64");
+    let arch = env::var("TARGET")
+        .map(|t| t.split('-').next().unwrap_or_default().to_string())
+        .unwrap_or_default();
+    let xwin_sdk_lib = cargo_xwin_base.join("xwin/sdk/lib/um").join(arch);
     if !xwin_sdk_lib.exists() {
         return Ok(());
     }