diff --git a/dlls/dsound/propset.c b/dlls/dsound/propset.c
index 7bb7f4f5c2b..4017f07be6c 100644
--- a/dlls/dsound/propset.c
+++ b/dlls/dsound/propset.c
@@ -200,6 +200,7 @@ HRESULT IKsBufferPropertySetImpl_Create(
     PIDSDRIVERPROPERTYSET ps = NULL;
     IKsBufferPropertySetImpl *iks;
     TRACE("(%p,%p)\n",dsb,piks);
+    *piks = NULL;
 
     if (!dsb->hwbuf)
         return DSERR_INVALIDPARAM;