diff --git a/build.rs b/build.rs
index 0a1e301..4e261a3 100644
--- a/build.rs
+++ b/build.rs
@@ -23,6 +23,7 @@ macro_rules! host {
 
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rustc-check-cfg=cfg(host_os, values(\"windows\"))");
 
     let target = env_var("TARGET");
     let host = env_var("HOST");
@@ -32,6 +33,10 @@ fn main() {
         .replace("{TARGET}", &target.escape_debug().to_string())
         .replace("{HOST}", &host.escape_debug().to_string());
     fs::write(out, macros).unwrap();
+
+    if let Some("windows") = host.split('-').nth(2) {
+        println!("cargo:rustc-cfg=host_os=\"windows\"");
+    }
 }
 
 fn env_var(key: &str) -> String {
diff --git a/src/lib.rs b/src/lib.rs
index de74d52..30179fd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,8 +6,12 @@
 
 #![doc(html_root_url = "https://docs.rs/target-triple/0.1.2")]
 
+#[cfg(not(host_os = "windows"))]
 include!(concat!(env!("OUT_DIR"), "/macros.rs"));
 
+#[cfg(host_os = "windows")]
+include!(concat!(env!("OUT_DIR"), "\\macros.rs"));
+
 /// The target triple that is being compiled for.
 pub const TARGET: &str = target!();