diff --git a/tests/run-pass/stacked-borrows/interior_mutability.rs b/tests/run-pass/stacked-borrows/interior_mutability.rs
index d27519df48a7..bd19f153deeb 100644
--- a/tests/run-pass/stacked-borrows/interior_mutability.rs
+++ b/tests/run-pass/stacked-borrows/interior_mutability.rs
@@ -1,4 +1,4 @@
-#![feature(maybe_uninit, maybe_uninit_ref)]
+#![feature(maybe_uninit_extra, maybe_uninit_ref)]
 use std::mem::MaybeUninit;
 use std::cell::{Cell, RefCell, UnsafeCell};