diff --git a/sys/dev/txp/if_txp.c b/sys/dev/txp/if_txp.c
index 976b0f26d29..2a7221de4f9 100644
--- a/sys/dev/txp/if_txp.c
+++ b/sys/dev/txp/if_txp.c
@@ -332,7 +332,8 @@ txp_attach(dev)
 	ifp->if_softc = sc;
 	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 	ifp->if_mtu = ETHERMTU;
-	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
+	    IFF_NEEDSGIANT;
 	ifp->if_ioctl = txp_ioctl;
 	ifp->if_start = txp_start;
 	ifp->if_watchdog = txp_watchdog;