diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
@@ -8,10 +8,8 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
-// This test hangs forever when built against libstdc++ and MSVC. In order to allow
-// validation of the test suite against other STLs we have to mark it
-// unsupported.
-// UNSUPPORTED: stdlib=libstdc++, stdlib=msvc
+// This test hangs forever when built against libstdc++ (Oct 2016)
+// UNSUPPORTED: stdlib=libstdc++
 
 // <mutex>