Index: test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
===================================================================
--- test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
+++ test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: thread-safety
+
 // <mutex>
 
 // This test does not define _LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS so it