diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index 72fc0441d3b9..0f23e0bc836c 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -969,8 +969,8 @@ ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
 
 	ifp->if_addrlen = ETHER_ADDR_LEN;
 	ifp->if_hdrlen = ETHER_HDR_LEN;
-	if_attach(ifp);
 	ifp->if_mtu = ETHERMTU;
+	if_attach(ifp);
 	ifp->if_output = ether_output;
 	ifp->if_input = ether_input;
 	ifp->if_resolvemulti = ether_resolvemulti;