diff --git a/library/alloc/src/raw_vec/tests.rs b/library/alloc/src/raw_vec/tests.rs
index f348710d61a..41d6c98b481 100644
--- a/library/alloc/src/raw_vec/tests.rs
+++ b/library/alloc/src/raw_vec/tests.rs
@@ -1,6 +1,10 @@
+#![feature(cell_update)]
+
 use super::*;
 use std::cell::Cell;
 
+
+
 #[test]
 fn allocator_param() {
     use crate::alloc::AllocErr;