diff --git a/dlls/wined3d/clipper.c b/dlls/wined3d/clipper.c
index 2d3184f62b2..febd92bfad1 100644
--- a/dlls/wined3d/clipper.c
+++ b/dlls/wined3d/clipper.c
@@ -28,22 +28,23 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(d3d);
 
-static HRESULT WINAPI IWineD3DClipperImpl_QueryInterface(IWineD3DClipper *iface, REFIID riid, void **Obj)
+static HRESULT WINAPI IWineD3DClipperImpl_QueryInterface(IWineD3DClipper *iface, REFIID riid, void **object)
 {
-    IWineD3DClipperImpl *This = (IWineD3DClipperImpl *)iface;
+    TRACE("iface %p, riid %s, object %p.\n", iface, debugstr_guid(riid), object);
 
-    TRACE("(%p)->(%p,%p)\n", This, riid, Obj);
-    if (IsEqualGUID(&IID_IUnknown, riid)
-        || IsEqualGUID(&IID_IWineD3DClipper, riid))
+    if (IsEqualGUID(riid, &IID_IWineD3DClipper)
+            || IsEqualGUID(riid, &IID_IWineD3DBase)
+            || IsEqualGUID(riid, &IID_IUnknown))
     {
-        *Obj = iface;
-        IWineD3DClipper_AddRef(iface);
+        IUnknown_AddRef(iface);
+        *object = iface;
         return S_OK;
     }
-    else
-    {
-        return E_NOINTERFACE;
-    }
+
+    WARN("%s not implemented, returning E_NOINTERFACE.\n", debugstr_guid(riid));
+
+    *object = NULL;
+    return E_NOINTERFACE;
 }
 
 static ULONG WINAPI IWineD3DClipperImpl_AddRef(IWineD3DClipper *iface )