diff --git a/std/src/sync/reentrant_lock.rs b/std/src/sync/reentrant_lock.rs
index 80b9e0cf15214..f7fe8eb1c7fd5 100644
--- a/std/src/sync/reentrant_lock.rs
+++ b/std/src/sync/reentrant_lock.rs
@@ -116,6 +116,9 @@ pub struct ReentrantLockGuard<'a, T: ?Sized + 'a> {
 #[unstable(feature = "reentrant_lock", issue = "121440")]
 impl<T: ?Sized> !Send for ReentrantLockGuard<'_, T> {}
 
+#[unstable(feature = "reentrant_lock", issue = "121440")]
+unsafe impl<T: ?Sized + Sync> Sync for ReentrantLockGuard<'_, T> {}
+
 #[unstable(feature = "reentrant_lock", issue = "121440")]
 impl<T> ReentrantLock<T> {
     /// Creates a new re-entrant lock in an unlocked state ready for use.