diff --git a/src/lib.rs b/src/lib.rs
index 0f800cea0ae16..a1032f0dda949 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -114,7 +114,7 @@ cfg_if! {
 
         mod switch;
         pub use switch::*;
-    } else if #[cfg(unix)] {
+    } else if #[cfg(any(unix, target_os="redox"))] {
         mod fixed_width_ints;
         pub use fixed_width_ints::*;