diff --git a/tokio/src/runtime/tests/loom_join_set.rs b/tokio/src/runtime/tests/loom_join_set.rs
index bd343876a..279deaec1 100644
--- a/tokio/src/runtime/tests/loom_join_set.rs
+++ b/tokio/src/runtime/tests/loom_join_set.rs
@@ -1,3 +1,4 @@
+#![cfg(tokio_unstable)]
 use crate::runtime::Builder;
 use crate::task::JoinSet;