diff --git a/include/dsound.h b/include/dsound.h
index bf8e4f66d25..50ea2c890f8 100644
--- a/include/dsound.h
+++ b/include/dsound.h
@@ -315,8 +315,11 @@ extern HRESULT WINAPI DirectSoundCaptureEnumerateA(LPDSENUMCALLBACKA, LPVOID);
 extern HRESULT WINAPI DirectSoundCaptureEnumerateW(LPDSENUMCALLBACKW, LPVOID);
 
 extern HRESULT WINAPI DirectSoundCreate8(LPCGUID lpGUID,LPDIRECTSOUND8 *ppDS8,LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DirectSoundCaptureCreate(LPCGUID lpGUID, LPDIRECTSOUNDCAPTURE *ppDSC8, LPUNKNOWN pUnkOuter);
-/* FIXME: DirectSoundFullDuplexCreate */
+extern HRESULT WINAPI DirectSoundCaptureCreate8(LPCGUID lpGUID, LPDIRECTSOUNDCAPTURE *ppDSC8, LPUNKNOWN pUnkOuter);
+extern HRESULT WINAPI DirectSoundFullDuplexCreate(LPCGUID pcGuidCaptureDevice, LPCGUID pcGuidRenderDevice, 
+    LPCDSCBUFFERDESC pcDSCBufferDesc, LPCDSBUFFERDESC pcDSBufferDesc, HWND hWnd, DWORD dwLevel, 
+    LPDIRECTSOUNDFULLDUPLEX *ppDSFD, LPDIRECTSOUNDCAPTUREBUFFER8 *ppDSCBuffer8, LPDIRECTSOUNDBUFFER8 *ppDSBuffer8, LPUNKNOWN pUnkOuter); 
+#define DirectSoundFullDuplexCreate8 DirectSoundFullDuplexCreate
 extern HRESULT WINAPI GetDeviceID(LPCGUID lpGuidSrc, LPGUID lpGuidDest);