diff --git a/include/dsound.h b/include/dsound.h
index e1bd6680fc5..0923561ceec 100644
--- a/include/dsound.h
+++ b/include/dsound.h
@@ -1074,7 +1074,7 @@ DECLARE_INTERFACE_(IDirectSound3DBuffer,IUnknown)
 #define IDirectSound3DBuffer_GetPosition(p,a)              (p)->lpVtbl->GetPosition(p,a)
 #define IDirectSound3DBuffer_GetVelocity(p,a)              (p)->lpVtbl->GetVelocity(p,a)
 #define IDirectSound3DBuffer_SetAllParameters(p,a,b)       (p)->lpVtbl->SetAllParameters(p,a,b)
-#define IDirectSound3DBuffer_SetConeAngles(p,a,b)          (p)->lpVtbl->SetConeAngles(p,a,b)
+#define IDirectSound3DBuffer_SetConeAngles(p,a,b,c)        (p)->lpVtbl->SetConeAngles(p,a,b,c)
 #define IDirectSound3DBuffer_SetConeOrientation(p,a,b,c,d) (p)->lpVtbl->SetConeOrientation(p,a,b,c,d)
 #define IDirectSound3DBuffer_SetConeOutsideVolume(p,a,b)   (p)->lpVtbl->SetConeOutsideVolume(p,a,b)
 #define IDirectSound3DBuffer_SetMaxDistance(p,a,b)         (p)->lpVtbl->SetMaxDistance(p,a,b)