diff --git a/src/browser/fake_network.js b/src/browser/fake_network.js
index ce2af74b..8781d374 100644
--- a/src/browser/fake_network.js
+++ b/src/browser/fake_network.js
@@ -45,12 +45,10 @@ const TCP_DYNAMIC_PORT_RANGE = TCP_DYNAMIC_PORT_END - TCP_DYNAMIC_PORT_START;
 
 const ETH_HEADER_SIZE     = 14;
 const ETH_PAYLOAD_OFFSET  = ETH_HEADER_SIZE;
-const MTU_DEFAULT = 1500;
-//const ETH_PAYLOAD_SIZE    = 1500; //mtu
+const MTU_DEFAULT         = 1500;
 const ETH_TRAILER_SIZE    = 4;
 const IPV4_HEADER_SIZE    = 20;
 const IPV4_PAYLOAD_OFFSET = ETH_PAYLOAD_OFFSET + IPV4_HEADER_SIZE;
-//const IPV4_PAYLOAD_SIZE   = ETH_PAYLOAD_SIZE - IPV4_HEADER_SIZE;
 const UDP_HEADER_SIZE     = 8;
 const UDP_PAYLOAD_OFFSET  = IPV4_PAYLOAD_OFFSET + UDP_HEADER_SIZE;
 const TCP_HEADER_SIZE     = 20;
diff --git a/src/virtio_net.js b/src/virtio_net.js
index f73cc281..c34685d7 100644
--- a/src/virtio_net.js
+++ b/src/virtio_net.js
@@ -9,7 +9,7 @@ import * as marshall from "../lib/marshall.js";
 import { CPU } from "./cpu.js";
 import { BusConnector } from "./bus.js";
 
-const DEFAULT_MTU = 1500;
+const MTU_DEFAULT = 1500;
 
 const VIRTIO_NET_F_MAC = 5;
 const VIRTIO_NET_F_CTRL_VQ = 17;
@@ -28,7 +28,7 @@ const VIRTIO_NET_CTRL_MAC_ADDR_SET = 1;
  * @param {Boolean} preserve_mac_from_state_image
  * @param {number} mtu
  */
-export function VirtioNet(cpu, bus, preserve_mac_from_state_image, mtu = DEFAULT_MTU)
+export function VirtioNet(cpu, bus, preserve_mac_from_state_image, mtu = MTU_DEFAULT)
 {
     /** @const @type {BusConnector} */
     this.bus = bus;