diff --git a/include/winnt.h b/include/winnt.h
index 04353d9405d..83fcc67c85d 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -6897,7 +6897,7 @@ static inline BOOLEAN BitScanReverse(DWORD *index, DWORD mask)
 #if defined(_MSC_VER)
 
 #define InterlockedCompareExchange128 _InterlockedCompareExchange128
-static inline unsigned char _InterlockedCompareExchange128(__int64 *dest, __int64 xchg_high, __int64 xchg_low, __int64 *compare);
+unsigned char _InterlockedCompareExchange128(volatile __int64 *dest, __int64 xchg_high, __int64 xchg_low, __int64 *compare);
 #pragma intrinsic(_InterlockedCompareExchange128)
 
 #elif defined(__x86_64__)