diff --git a/audio/drivers/xaudio.cpp b/audio/drivers/xaudio.cpp
index e8c715c891..64e81cc086 100644
--- a/audio/drivers/xaudio.cpp
+++ b/audio/drivers/xaudio.cpp
@@ -59,7 +59,7 @@ struct xaudio2 : public IXAudio2VoiceCallback
    STDMETHOD_(void, OnBufferStart) (void *) {}
    STDMETHOD_(void, OnBufferEnd) (void *) 
    {
-      InterlockedDecrement(&buffers);
+      InterlockedDecrement((LONG volatile*)&buffers);
       SetEvent(hEvent);
    }
    STDMETHOD_(void, OnLoopEnd) (void *) {}
@@ -219,7 +219,7 @@ static size_t xaudio2_write(xaudio2_t *handle, const void *buf, size_t bytes_)
          if (FAILED(handle->pSourceVoice->SubmitSourceBuffer(&xa2buffer, NULL)))
             return 0;
 
-         InterlockedIncrement(&handle->buffers);
+         InterlockedIncrement((LONG volatile*)&handle->buffers);
          handle->bufptr       = 0;
          handle->write_buffer = (handle->write_buffer + 1) & MAX_BUFFERS_MASK;
       }
diff --git a/audio/drivers/xaudio.h b/audio/drivers/xaudio.h
index b2f2cb74cc..af2af0012c 100644
--- a/audio/drivers/xaudio.h
+++ b/audio/drivers/xaudio.h
@@ -27,6 +27,7 @@
 #define X2DEFAULT(x) = (x)
 
 #ifdef _XBOX
+#include <xtl.h>
 
 #define DEFINE_CLSID(className, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
 	DEFINE_GUID(CLSID_##className, 0x##l, 0x##w1, 0x##w2, 0x##b1, 0x##b2, 0x##b3, 0x##b4, 0x##b5, 0x##b6, 0x##b7, 0x##b8)