diff --git a/dlls/dsound/capture.c b/dlls/dsound/capture.c
index 05ab8050bd4..a7977d67bf8 100644
--- a/dlls/dsound/capture.c
+++ b/dlls/dsound/capture.c
@@ -1366,7 +1366,7 @@ HRESULT IDirectSoundCaptureBufferImpl_Create(
 
         if (wfex->wFormatTag == WAVE_FORMAT_PCM) {
 	    device->pwfx = HeapAlloc(GetProcessHeap(),0,sizeof(WAVEFORMATEX));
-            CopyMemory(device->pwfx, wfex, sizeof(WAVEFORMATEX));
+            *device->pwfx = *wfex;
 	    device->pwfx->cbSize = 0;
 	} else {
 	    device->pwfx = HeapAlloc(GetProcessHeap(),0,sizeof(WAVEFORMATEX)+wfex->cbSize);
diff --git a/dlls/dsound/dsound_main.c b/dlls/dsound/dsound_main.c
index 2a1d1ca767a..d7c50b8658c 100644
--- a/dlls/dsound/dsound_main.c
+++ b/dlls/dsound/dsound_main.c
@@ -254,19 +254,19 @@ HRESULT WINAPI GetDeviceID(LPCGUID pGuidSrc, LPGUID pGuidDest)
 
     if ( IsEqualGUID( &DSDEVID_DefaultPlayback, pGuidSrc ) ||
     	 IsEqualGUID( &DSDEVID_DefaultVoicePlayback, pGuidSrc ) ) {
-	CopyMemory(pGuidDest, &DSOUND_renderer_guids[ds_default_playback], sizeof(GUID));
+	*pGuidDest = DSOUND_renderer_guids[ds_default_playback];
         TRACE("returns %s\n", get_device_id(pGuidDest));
 	return DS_OK;
     }
 
     if ( IsEqualGUID( &DSDEVID_DefaultCapture, pGuidSrc ) ||
     	 IsEqualGUID( &DSDEVID_DefaultVoiceCapture, pGuidSrc ) ) {
-	CopyMemory(pGuidDest, &DSOUND_capture_guids[ds_default_capture], sizeof(GUID));
+	*pGuidDest = DSOUND_capture_guids[ds_default_capture];
         TRACE("returns %s\n", get_device_id(pGuidDest));
 	return DS_OK;
     }
 
-    CopyMemory(pGuidDest, pGuidSrc, sizeof(GUID));
+    *pGuidDest = *pGuidSrc;
     TRACE("returns %s\n", get_device_id(pGuidDest));
 
     return DS_OK;
diff --git a/dlls/dsound/primary.c b/dlls/dsound/primary.c
index e5d31c68dce..112bb398cf9 100644
--- a/dlls/dsound/primary.c
+++ b/dlls/dsound/primary.c
@@ -1173,7 +1173,7 @@ HRESULT PrimaryBufferImpl_Create(
 	dsb->device = device;
 	dsb->lpVtbl = &dspbvt;
 
-	CopyMemory(&device->dsbd, dsbd, sizeof(*dsbd));
+	device->dsbd = *dsbd;
 
 	TRACE("Created primary buffer at %p\n", dsb);
 	TRACE("(formattag=0x%04x,chans=%d,samplerate=%d,"