diff --git a/include/winnt.h b/include/winnt.h
index 4739f9a1a0f..d1c82084f9f 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -6756,6 +6756,7 @@ typedef enum _FIRMWARE_TYPE
 #define InterlockedDecrement64 _InterlockedDecrement64
 #define InterlockedExchange _InterlockedExchange
 #define InterlockedExchangeAdd _InterlockedExchangeAdd
+#define InterlockedExchangeAdd16 _InterlockedExchangeAdd16
 #define InterlockedExchangeAdd64 _InterlockedExchangeAdd64
 #define InterlockedExchangePointer _InterlockedExchangePointer
 #define InterlockedIncrement _InterlockedIncrement
@@ -6776,6 +6777,7 @@ typedef enum _FIRMWARE_TYPE
 #pragma intrinsic(_InterlockedCompareExchangePointer)
 #pragma intrinsic(_InterlockedExchange)
 #pragma intrinsic(_InterlockedExchangeAdd)
+#pragma intrinsic(_InterlockedExchangeAdd16)
 #pragma intrinsic(_InterlockedExchangePointer)
 #pragma intrinsic(_InterlockedIncrement)
 #pragma intrinsic(_InterlockedIncrement16)
@@ -6795,6 +6797,7 @@ long      _InterlockedDecrement(long volatile*);
 short     _InterlockedDecrement16(short volatile*);
 long      _InterlockedExchange(long volatile*,long);
 long      _InterlockedExchangeAdd(long volatile*,long);
+short     _InterlockedExchangeAdd16(short volatile*,short);
 void *    _InterlockedExchangePointer(void *volatile*,void*);
 long      _InterlockedIncrement(long volatile*);
 short     _InterlockedIncrement16(short volatile*);
@@ -7027,6 +7030,11 @@ static FORCEINLINE LONG WINAPI InterlockedExchangeAdd( LONG volatile *dest, LONG
     return __sync_fetch_and_add( dest, incr );
 }
 
+static FORCEINLINE short WINAPI InterlockedExchangeAdd16( short volatile *dest, short incr )
+{
+    return __sync_fetch_and_add( dest, incr );
+}
+
 static FORCEINLINE LONGLONG WINAPI InterlockedExchangeAdd64( LONGLONG volatile *dest, LONGLONG incr )
 {
     return __sync_fetch_and_add( dest, incr );