diff --git a/libc/include/stdatomic.h b/libc/include/stdatomic.h
index 3db25a78e..bcea85924 100644
--- a/libc/include/stdatomic.h
+++ b/libc/include/stdatomic.h
@@ -89,6 +89,7 @@ using std::atomic_signal_fence;
 using std::memory_order;
 using std::memory_order_relaxed;
 using std::memory_order_consume;
+using std::memory_order_acquire;
 using std::memory_order_release;
 using std::memory_order_acq_rel;
 using std::memory_order_seq_cst;