diff --git a/site.conf b/site.conf
index c1e7c560d27fe17a30877d014d89b5f0aeabb9ec..5043287942ea1a07a406edd9e1851fd7d36cb2ba 100644
--- a/site.conf
+++ b/site.conf
@@ -39,7 +39,7 @@
 
 	fastd_mesh_vpn = {
 		methods = { 'salsa2012+gmac' },
-		mtu = 1426,
+		mtu = 1312,
 		backbone = {
 			limit = 2,
 			peers = {