diff --git a/engine/client/snd_dma.c b/engine/client/snd_dma.c
index d6e81486f..acc97d9d7 100644
--- a/engine/client/snd_dma.c
+++ b/engine/client/snd_dma.c
@@ -977,7 +977,7 @@ void S_ClearBuffer (soundcardinfo_t *sc)
 
 		reps = 0;
 
-		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, &pData, &dwSize, NULL, NULL, 0)) != DS_OK)
+		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, (void**)&pData, &dwSize, NULL, NULL, 0)) != DS_OK)
 		{
 			if (hresult != DSERR_BUFFERLOST)
 			{
diff --git a/engine/client/snd_mix.c b/engine/client/snd_mix.c
index 2ca3cb567..05701808e 100644
--- a/engine/client/snd_mix.c
+++ b/engine/client/snd_mix.c
@@ -90,8 +90,8 @@ void S_TransferStereo16 (soundcardinfo_t *sc, int endtime)
 	{
 		reps = 0;
 
-		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, &pbuf, &dwSize, 
-									   &pbuf2, &dwSize2, 0)) != DS_OK)
+		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, (void**)&pbuf, &dwSize, 
+									   (void**)&pbuf2, &dwSize2, 0)) != DS_OK)
 		{
 			if (hresult != DSERR_BUFFERLOST)
 			{
@@ -213,8 +213,8 @@ void S_Transfer4Speaker16 (soundcardinfo_t *sc, int endtime)
 	{
 		reps = 0;
 
-		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, &pbuf, &dwSize, 
-									   &pbuf2, &dwSize2, 0)) != DS_OK)
+		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, (void**)&pbuf, &dwSize, 
+									  (void**)&pbuf2, &dwSize2, 0)) != DS_OK)
 		{
 			if (hresult != DSERR_BUFFERLOST)
 			{
@@ -357,8 +357,8 @@ void S_Transfer6Speaker16 (soundcardinfo_t *sc, int endtime)
 	{
 		reps = 0;
 
-		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, &pbuf, &dwSize, 
-									   &pbuf2, &dwSize2, 0)) != DS_OK)
+		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, (void**)&pbuf, &dwSize, 
+									   (void**)&pbuf2, &dwSize2, 0)) != DS_OK)
 		{
 			if (hresult != DSERR_BUFFERLOST)
 			{
@@ -463,8 +463,8 @@ void S_TransferPaintBuffer(soundcardinfo_t *sc, int endtime)
 	{
 		reps = 0;
 
-		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, &pbuf, &dwSize, 
-									   &pbuf2,&dwSize2, 0)) != DS_OK)
+		while ((hresult = sc->pDSBuf->lpVtbl->Lock(sc->pDSBuf, 0, sc->gSndBufSize, (void**)&pbuf, &dwSize, 
+									   (void**)&pbuf2,&dwSize2, 0)) != DS_OK)
 		{
 			if (hresult != DSERR_BUFFERLOST)
 			{