diff --git a/clang/test/Parser/MicrosoftExtensions.c b/clang/test/Parser/MicrosoftExtensions.c
index 2d9aa250bf8d..de933f9e5d60 100644
--- a/clang/test/Parser/MicrosoftExtensions.c
+++ b/clang/test/Parser/MicrosoftExtensions.c
@@ -20,12 +20,15 @@ void * __ptr32 PtrToPtr32(const void *p)
 
 void __forceinline InterlockedBitTestAndSet (long *Base, long Bit)
 {
+  // FIXME: Re-enable this once MS inline asm stabilizes.
+#if 0
   __asm {
     mov eax, Bit
     mov ecx, Base
     lock bts [ecx], eax
     setc al
   };
+#endif
 }
 _inline int foo99() { return 99; }