diff --git a/core-graphics-types/src/lib.rs b/core-graphics-types/src/lib.rs
index f34bf0120..cc8fe3115 100644
--- a/core-graphics-types/src/lib.rs
+++ b/core-graphics-types/src/lib.rs
@@ -7,6 +7,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos"))]
+
 extern crate libc;
 extern crate core_foundation;