diff --git a/dlls/dsound/buffer.c b/dlls/dsound/buffer.c
index 310d2c30a17..37a14a7865f 100644
--- a/dlls/dsound/buffer.c
+++ b/dlls/dsound/buffer.c
@@ -1191,6 +1191,7 @@ HRESULT WINAPI IDirectSoundBufferImpl_Create(
 		DSOUND_RecalcVolPan(&(dsb->volpan));
 
 	InitializeCriticalSection(&(dsb->lock));
+        dsb->lock.DebugInfo->Spare[1] = (DWORD)"DSOUNDBUFFER_lock";
 
 	/* register buffer */
 	RtlAcquireResourceExclusive(&(ds->lock), TRUE);
diff --git a/dlls/dsound/capture.c b/dlls/dsound/capture.c
index b8c526c19e1..da0db2cab30 100644
--- a/dlls/dsound/capture.c
+++ b/dlls/dsound/capture.c
@@ -147,6 +147,7 @@ DirectSoundCaptureCreate8(
         This->state = STATE_STOPPED;
 
         InitializeCriticalSection( &(This->lock) );
+        This->lock.DebugInfo->Spare[1] = (DWORD)"DSCAPTURE_lock";
 
         This->lpVtbl = &dscvt;
         dsound_capture = This;
@@ -1746,6 +1747,7 @@ DirectSoundFullDuplexCreate(
         This->lpVtbl = &dsfdvt;
 
         InitializeCriticalSection( &(This->lock) );
+        This->lock.DebugInfo->Spare[1] = (DWORD)"DSDUPLEX_lock";
 
         hres = IDirectSoundFullDuplexImpl_Initialize( (LPDIRECTSOUNDFULLDUPLEX)This,
                                                       pcGuidCaptureDevice, pcGuidRenderDevice,
diff --git a/dlls/dsound/dsound.c b/dlls/dsound/dsound.c
index 02fcd6f83a3..77e01cb6cf5 100644
--- a/dlls/dsound/dsound.c
+++ b/dlls/dsound/dsound.c
@@ -555,6 +555,7 @@ static HRESULT WINAPI IDirectSoundImpl_DuplicateSoundBuffer(
     dsb->dsb = NULL;
     memcpy(&(dsb->wfx), &(pdsb->wfx), sizeof(dsb->wfx));
     InitializeCriticalSection(&(dsb->lock));
+    dsb->lock.DebugInfo->Spare[1] = (DWORD)"DSOUNDBUFFER_lock";
     /* register buffer */
     RtlAcquireResourceExclusive(&(This->lock), TRUE);
     {