diff --git a/include/dsound.h b/include/dsound.h
index 9dd9671cb77..c7a2bd51e8d 100644
--- a/include/dsound.h
+++ b/include/dsound.h
@@ -668,6 +668,8 @@ DECLARE_INTERFACE_(IDirectSoundBuffer8,IUnknown)
 };
 #undef INTERFACE
 
+DEFINE_GUID(GUID_All_Objects, 0xaa114de5, 0xc262, 0x4169, 0xa1, 0xc8, 0x23, 0xd6, 0x98, 0xcc, 0x73, 0xb5);
+
 #if !defined(__cplusplus) || defined(CINTERFACE)
 /*** IUnknown methods ***/
 #define IDirectSoundBuffer8_QueryInterface(p,a,b) (p)->lpVtbl->QueryInterface(p,a,b)