diff --git a/ext-peer.netdev.j2 b/ext-peer.netdev.j2
index 0db74f6..2847d4f 100644
--- a/ext-peer.netdev.j2
+++ b/ext-peer.netdev.j2
@@ -2,6 +2,9 @@
 Name=dn42{{ item['remotename'] }}
 Kind=wireguard
 Description=DN42 peering with AS{{ item.asn }} @ {% if item.remotehost is defined %}{{ item.remotehost }}[{{ item.remoteip }}]:{{ item.remoteport }}{% else %}[{{ item.remoteip }}]:{{ item.remoteport }}{% endif %}
+{% if mtu is defined %}
+MTUBytes={{ mtu }}
+{% endif %}
 
 [WireGuard]
 {% if item.keypath is defined %}