diff --git a/src/lib.rs b/src/lib.rs
index 08d03d0e78..933561a7ef 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -39,8 +39,8 @@ extern crate static_assertions;
 extern crate probe;
 
 // Use the `{likely, unlikely}` provided by compiler when using nightly
-#[rustversion::nightly]
-#![feature(core_intrinsics)]
+#![rustversion::nightly]
+#[feature(core_intrinsics)]
 
 mod mmtk;
 pub use mmtk::MMTKBuilder;