diff --git a/src/lib.rs b/src/lib.rs
index 554e9df..71d1a15 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,18 +14,18 @@ extern crate std;
 
 pub use context::Context;
 pub use stack::Stack;
+
 #[cfg(feature = "os")]
 pub use os::Stack as OsStack;
 
-#[cfg(not(test))]
-mod std { pub use core::*; }
-
 mod context;
 mod stack;
 
-mod debug;
-
-mod arch;
-
 #[cfg(feature = "os")]
 mod os;
+
+mod arch;
+mod debug;
+
+#[cfg(not(test))]
+mod std { pub use core::*; }