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-rw-r--r--lib/System/Atomic.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/System/Atomic.cpp b/lib/System/Atomic.cpp
index 8c61ff1069..cefd0bbf55 100644
--- a/lib/System/Atomic.cpp
+++ b/lib/System/Atomic.cpp
@@ -18,6 +18,7 @@ using namespace llvm;
#if defined(_MSC_VER)
#include <windows.h>
+#undef MemoryFence
#endif
void sys::MemoryFence() {