diff --git a/src/lib.rs b/src/lib.rs
index 225d039..097ca94 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -27,5 +27,3 @@ mod arch;
 
 #[cfg(feature = "os")]
 pub mod os;
-#[cfg(feature = "os")]
-mod sys;
diff --git a/src/os.rs b/src/os/mod.rs
similarity index 99%
rename from src/os.rs
rename to src/os/mod.rs
index f144312..1a0e23d 100644
--- a/src/os.rs
+++ b/src/os/mod.rs
@@ -4,7 +4,7 @@ extern crate std;
 use core::prelude::*;
 use self::std::io::Error as IoError;
 use stack;
-use sys;
+mod sys;
 
 pub struct StackSource;
 
diff --git a/src/sys/mod.rs b/src/os/sys/mod.rs
similarity index 100%
rename from src/sys/mod.rs
rename to src/os/sys/mod.rs
diff --git a/src/sys/unix.rs b/src/os/sys/unix.rs
similarity index 100%
rename from src/sys/unix.rs
rename to src/os/sys/unix.rs