Index: sys/net/if_bridge.c
===================================================================
--- sys/net/if_bridge.c
+++ sys/net/if_bridge.c
@@ -925,7 +925,7 @@
 {
 	struct ifnet *ifp = bif->bif_ifp;
 	struct ifreq ifr;
-	int error;
+	int error, mask, stuck;
 
 	BRIDGE_UNLOCK_ASSERT(sc);
 
@@ -938,10 +938,12 @@
 			if_printf(sc->sc_ifp,
 			    "error setting capabilities on %s: %d\n",
 			    ifp->if_xname, error);
-		if ((ifp->if_capenable & ~set) != 0)
+		mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
+		stuck = ifp->if_capenable & mask & ~set;
+		if (stuck != 0)
 			if_printf(sc->sc_ifp,
 			    "can't disable some capabilities on %s: 0x%x\n",
-			    ifp->if_xname, ifp->if_capenable & ~set);
+			    ifp->if_xname, stuck);
 	}
 }