diff --git a/site_config/stable/site/site.conf b/site_config/stable/site/site.conf
index 7d4c36b72ae8781d81c8e9d10efcf744b3362f72..9b6f5420db905a977aa7820fed7faf2e590c2e6d 100644
--- a/site_config/stable/site/site.conf
+++ b/site_config/stable/site/site.conf
@@ -87,8 +87,8 @@
   -- what these options do.
   mesh_vpn = {
     enabled = true,
-    mtu = 1406,
    fastd = {
+    mtu = 1406,
     configurable = true,
     -- List of crypto-methods to use.
     methods = {'salsa2012+umac'},