cpu_to_le16(IPV6_TCPOPT_DELAYED_ACK_DISABLE);
                else
                        init_fw_cb->ipv6_tcp_opts &=
-                               cpu_to_le16(~IPV6_TCPOPT_DELAYED_ACK_DISABLE);
+                               cpu_to_le16(~IPV6_TCPOPT_DELAYED_ACK_DISABLE &
+                                           0xFFFF);
                break;
        case ISCSI_NET_PARAM_TCP_NAGLE_DISABLE:
                if (iface_param->iface_num & 0x1)
                                cpu_to_le16(TCPOPT_DELAYED_ACK_DISABLE);
                else
                        init_fw_cb->ipv4_tcp_opts &=
-                               cpu_to_le16(~TCPOPT_DELAYED_ACK_DISABLE);
+                               cpu_to_le16(~TCPOPT_DELAYED_ACK_DISABLE &
+                                           0xFFFF);
                break;
        case ISCSI_NET_PARAM_TCP_NAGLE_DISABLE:
                if (iface_param->iface_num & 0x1)