diff --git a/kernel/futex.c b/kernel/futex.c
index dda2049..c2b2e0b 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -948,6 +948,7 @@
 	/* In the common case we don't take the spinlock, which is nice. */
  retry:
 	lock_ptr = q->lock_ptr;
+	barrier();
 	if (lock_ptr != 0) {
 		spin_lock(lock_ptr);
 		/*