diff --git a/build.rs b/build.rs
index b5eecd2..19416ce 100644
--- a/build.rs
+++ b/build.rs
@@ -1,12 +1,12 @@
-#[cfg(windows)]
+#[cfg(target_os = "windows")]
 extern crate winres;
 
-#[cfg(windows)]
+#[cfg(target_os = "windows")]
 fn main() {
     let mut res = winres::WindowsResource::new();
     res.set_icon("icon.ico");
     res.compile().unwrap();
 }
 
-#[cfg(unix)]
+#[cfg(not(target_os = "windows"))]
 fn main() {}