diff --git a/README.md b/README.md
index 74c446e..2f9da80 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ docker-compose up
 | `WGUI_ENDPOINT_ADDRESS`       | The default endpoint address used in global settings where clients should connect to. The endpoint can contain a port as well, useful when you are listening internally on the `WGUI_SERVER_LISTEN_PORT` port, but you forward on another port (ex 9000). Ex: myvpn.dyndns.com:9000 | Resolved to your public ip address |
 | `WGUI_FAVICON_FILE_PATH`      | The file path used as website favicon                                                                                                                                                                                                                                               | Embedded WireGuard logo            |
 | `WGUI_DNS`                    | The default DNS servers (comma-separated-list) used in the global settings                                                                                                                                                                                                          | `1.1.1.1`                          |
-| `WGUI_MTU`                    | The default MTU used in global settings                                                                                                                                                                                                                                             | `1450`                             |
+| `WGUI_MTU`                    | The default MTU used in global settings                                                                                                                                                                                                                                             | `1420`                             |
 | `WGUI_PERSISTENT_KEEPALIVE`   | The default persistent keepalive for WireGuard in global settings                                                                                                                                                                                                                   | `15`                               |
 | `WGUI_FIREWALL_MARK`          | The default WireGuard firewall mark                                                                                                                                                                                                                                                 | `0xca6c`  (51820)                  |
 | `WGUI_TABLE`                  | The default WireGuard table value settings                                                                                                                                                                                                                                          | `auto`                             |
diff --git a/templates/global_settings.html b/templates/global_settings.html
index 73b3c93..f708443 100644
--- a/templates/global_settings.html
+++ b/templates/global_settings.html
@@ -97,7 +97,7 @@ Global Settings
                             <dt>2. DNS Servers</dt>
                             <dd>The DNS servers will be set to client config.</dd>
                             <dt>3. MTU</dt>
-                            <dd>The MTU will be set to server and client config. By default it is <code>1450</code>. You might want
+                            <dd>The MTU will be set to server and client config. By default it is <code>1420</code>. You might want
                                 to adjust the MTU size if your connection (e.g PPPoE, 3G, satellite network, etc) has a low MTU.</dd>
                             <dd>Leave blank to omit this setting in the configs.</dd>
                             <dt>4. Persistent Keepalive</dt>
diff --git a/util/config.go b/util/config.go
index 4af6bd2..722fa03 100644
--- a/util/config.go
+++ b/util/config.go
@@ -37,7 +37,7 @@ const (
 	DefaultServerAddress                   = "10.252.1.0/24"
 	DefaultServerPort                      = 51820
 	DefaultDNS                             = "1.1.1.1"
-	DefaultMTU                             = 1450
+	DefaultMTU                             = 1420
 	DefaultPersistentKeepalive             = 15
 	DefaultFirewallMark                    = "0xca6c" // i.e. 51820
 	DefaultTable                           = "auto"