diff --git a/sys/net/if_tun.c b/sys/net/if_tun.c
index 498b122c3397..b7ce584a31ff 100644
--- a/sys/net/if_tun.c
+++ b/sys/net/if_tun.c
@@ -135,6 +135,8 @@ tunattach(dummy)
 		ifp->if_oerrors = 0;
 		ifp->if_ipackets = 0;
 		ifp->if_opackets = 0;
+		ifp->if_ibytes = 0;
+		ifp->if_obytes = 0;
 		if_attach(ifp);
 #if NBPFILTER > 0
 		bpfattach(ifp, DLT_NULL, sizeof(u_int));