diff --git a/include/dsound.h b/include/dsound.h
index 0923561ceec..b59405319e2 100644
--- a/include/dsound.h
+++ b/include/dsound.h
@@ -1098,7 +1098,7 @@ DECLARE_INTERFACE_(IDirectSound3DBuffer,IUnknown)
 #define IDirectSound3DBuffer_GetPosition(p,a)              (p)->GetPosition(a)
 #define IDirectSound3DBuffer_GetVelocity(p,a)              (p)->GetVelocity(a)
 #define IDirectSound3DBuffer_SetAllParameters(p,a,b)       (p)->SetAllParameters(a,b)
-#define IDirectSound3DBuffer_SetConeAngles(p,a,b)          (p)->SetConeAngles(a,b)
+#define IDirectSound3DBuffer_SetConeAngles(p,a,b,c)        (p)->SetConeAngles(a,b,c)
 #define IDirectSound3DBuffer_SetConeOrientation(p,a,b,c,d) (p)->SetConeOrientation(a,b,c,d)
 #define IDirectSound3DBuffer_SetConeOutsideVolume(p,a,b)   (p)->SetConeOutsideVolume(a,b)
 #define IDirectSound3DBuffer_SetMaxDistance(p,a,b)         (p)->SetMaxDistance(a,b)