--- work/VirtualBox-4.3.12/out/freebsd.amd64/release/bin/src/vboxnetadp/VBoxNetAdp-freebsd.c.orig	2014-12-13 20:23:59.236181109 +0200
+++ work/VirtualBox-4.3.12/out/freebsd.amd64/release/bin/src/vboxnetadp/VBoxNetAdp-freebsd.c	2014-12-13 20:27:48.068164516 +0200
@@ -234,7 +234,7 @@
     ifp->if_drv_flags |= IFF_DRV_OACTIVE;
     while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
     {
-        ifp->if_opackets++;
+        if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
         IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
         BPF_MTAP(ifp, m);
         m_freem(m);