Index: /trunk/src/VBox/HostDrivers/Support/win/SUPLib-win.cpp
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/win/SUPLib-win.cpp	(revision 66654)
+++ /trunk/src/VBox/HostDrivers/Support/win/SUPLib-win.cpp	(revision 66655)
@@ -647,5 +647,5 @@
     {
         NTSTATUS rcNt = NtClose((HANDLE)pThis->hDevice);
-        Assert(NT_SUCCESS(rcNt));
+        Assert(NT_SUCCESS(rcNt)); RT_NOREF(rcNt);
         pThis->hDevice = NIL_RTFILE; /* yes, that's right */
     }