diff --git a/Mixed-language-link-time-optimization.md b/Mixed-language-link-time-optimization.md
index 65c14d7..dd0136c 100644
--- a/Mixed-language-link-time-optimization.md
+++ b/Mixed-language-link-time-optimization.md
@@ -18,7 +18,7 @@ foo.rs
 
 ```rust
 #[no_std];
-#[allow(ctypes, cstack)];
+#[allow(ctypes)];
 
 extern {
     fn malloc(size: uint) -> *mut u8;