diff --git a/defaults/main.yml b/defaults/main.yml
index 13f0bc4..ad163f3 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -7,5 +7,6 @@ wireguard:
     route: []
     route6: []
     peers: {}
+    mtu: 1420
   connections: {}
 
diff --git a/templates/networkinterface.j2 b/templates/networkinterface.j2
index 7339b81..8289447 100644
--- a/templates/networkinterface.j2
+++ b/templates/networkinterface.j2
@@ -3,6 +3,7 @@ iface wg_{{ item.name }} inet manual
 	post-down ip link del $IFACE
 	pre-up ip link add $IFACE type wireguard || true
 	pre-up wg setconf $IFACE /etc/wireguard/$IFACE.conf
+	up ip link set dev $IFACE mtu {{ item.mtu }}
 {% if item.route|length == 1 and item.ip|length == 1%}
 	pre-up ip a add {{ item.ip[0] }} peer {{ item.route[0] }} dev $IFACE
 	up ip route replace {{ item.route[0] }} src {{ item.ip[0].split('/')[0] }} dev $IFACE