diff --git a/sys/dev/usb/if_aue.c b/sys/dev/usb/if_aue.c
index fbdb3df6cc8c..9588bf807927 100644
--- a/sys/dev/usb/if_aue.c
+++ b/sys/dev/usb/if_aue.c
@@ -717,7 +717,8 @@ USB_ATTACH(aue)
 	ifp->if_softc = sc;
 	if_initname(ifp, "aue", sc->aue_unit);
 	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 = aue_ioctl;
 	ifp->if_start = aue_start;
 	ifp->if_watchdog = aue_watchdog;
diff --git a/sys/dev/usb/if_axe.c b/sys/dev/usb/if_axe.c
index 72dcc7fa8a33..0b1839ea28fa 100644
--- a/sys/dev/usb/if_axe.c
+++ b/sys/dev/usb/if_axe.c
@@ -476,7 +476,8 @@ USB_ATTACH(axe)
 	ifp->if_softc = sc;
 	if_initname(ifp, "axe", sc->axe_unit);
 	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 = axe_ioctl;
 	ifp->if_start = axe_start;
 	ifp->if_watchdog = axe_watchdog;
diff --git a/sys/dev/usb/if_cue.c b/sys/dev/usb/if_cue.c
index ab519c4597fd..b7e715a25539 100644
--- a/sys/dev/usb/if_cue.c
+++ b/sys/dev/usb/if_cue.c
@@ -507,7 +507,8 @@ USB_ATTACH(cue)
 	ifp->if_softc = sc;
 	if_initname(ifp, "cue", sc->cue_unit);
 	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 = cue_ioctl;
 	ifp->if_start = cue_start;
 	ifp->if_watchdog = cue_watchdog;
diff --git a/sys/dev/usb/if_kue.c b/sys/dev/usb/if_kue.c
index fa733d30d68d..1e21d9cc66bf 100644
--- a/sys/dev/usb/if_kue.c
+++ b/sys/dev/usb/if_kue.c
@@ -481,7 +481,8 @@ USB_ATTACH(kue)
 	ifp->if_softc = sc;
 	if_initname(ifp, "kue", sc->kue_unit);
 	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 = kue_ioctl;
 	ifp->if_start = kue_start;
 	ifp->if_watchdog = kue_watchdog;
diff --git a/sys/dev/usb/if_rue.c b/sys/dev/usb/if_rue.c
index 9540ce8b4c90..e4ffd81a686a 100644
--- a/sys/dev/usb/if_rue.c
+++ b/sys/dev/usb/if_rue.c
@@ -660,7 +660,8 @@ USB_ATTACH(rue)
 	ifp->if_softc = sc;
 	if_initname(ifp, "rue", sc->rue_unit);
 	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 = rue_ioctl;
 	ifp->if_start = rue_start;
 	ifp->if_watchdog = rue_watchdog;
diff --git a/sys/dev/usb/if_udav.c b/sys/dev/usb/if_udav.c
index 2e3bf8883a25..6eab7bc49cd3 100644
--- a/sys/dev/usb/if_udav.c
+++ b/sys/dev/usb/if_udav.c
@@ -400,7 +400,8 @@ USB_ATTACH(udav)
 #elif defined(__FreeBSD__)
 	if_initname(ifp, "udav",  device_get_unit(self));
 #endif
-	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
+	    IFF_NEEDSGIANT;
 	ifp->if_start = udav_start;
 	ifp->if_ioctl = udav_ioctl;
 	ifp->if_watchdog = udav_watchdog;