diff --git a/dlls/dmsynth/synth.c b/dlls/dmsynth/synth.c
index 26d66fe9ed9..c85b71193e4 100644
--- a/dlls/dmsynth/synth.c
+++ b/dlls/dmsynth/synth.c
@@ -239,7 +239,7 @@ HRESULT WINAPI DMUSIC_CreateDirectMusicSynthImpl (LPCGUID lpcGUID, LPVOID* ppobj
 	TRACE("(%p,%p,%p)\n", lpcGUID, ppobj, pUnkOuter);
 	obj = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicSynth8Impl));
 	if (NULL == obj) {
-		*ppobj = (LPDIRECTMUSICSYNTH8) NULL;
+		*ppobj = NULL;
 		return E_OUTOFMEMORY;
 	}
 	obj->lpVtbl = &DirectMusicSynth8_Vtbl;
diff --git a/dlls/dmsynth/synthsink.c b/dlls/dmsynth/synthsink.c
index eb4583973a7..c0179571a3e 100644
--- a/dlls/dmsynth/synthsink.c
+++ b/dlls/dmsynth/synthsink.c
@@ -132,7 +132,7 @@ HRESULT WINAPI DMUSIC_CreateDirectMusicSynthSinkImpl (LPCGUID lpcGUID, LPVOID* p
 	TRACE("(%p,%p,%p)\n", lpcGUID, ppobj, pUnkOuter);
 	obj = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicSynthSinkImpl));
 	if (NULL == obj) {
-		*ppobj = (LPDIRECTMUSICSYNTHSINK) NULL;
+		*ppobj = NULL;
 		return E_OUTOFMEMORY;
 	}
 	obj->lpVtbl = &DirectMusicSynthSink_Vtbl;