diff --git a/reactos/include/reactos/libs/sound/mmebuddy.h b/reactos/include/reactos/libs/sound/mmebuddy.h
index aa1d939aff0..28cd6703058 100644
--- a/reactos/include/reactos/libs/sound/mmebuddy.h
+++ b/reactos/include/reactos/libs/sound/mmebuddy.h
@@ -327,6 +327,8 @@ typedef struct _SOUND_DEVICE_INSTANCE
     //PWAVEHDR CurrentWaveHeader;
     DWORD OutstandingBuffers;
     DWORD LoopsRemaining;
+    DWORD FrameSize;
+    DWORD BufferCount;
 } SOUND_DEVICE_INSTANCE, *PSOUND_DEVICE_INSTANCE;
 
 /* This lives in WAVEHDR.reserved */