diff --git a/openmptcprouter/files/etc/uci-defaults/1980-omr-firewall b/openmptcprouter/files/etc/uci-defaults/1980-omr-firewall
index c1a13dfeb..07ea31f1f 100755
--- a/openmptcprouter/files/etc/uci-defaults/1980-omr-firewall
+++ b/openmptcprouter/files/etc/uci-defaults/1980-omr-firewall
@@ -237,10 +237,10 @@ for intf in $allintf; do
 done
 
 
-#uci -q batch <<-EOF >/dev/null
-#	set firewall.zone_lan.mtu_fix='1'
-#	set firewall.zone_vpn.mtu_fix='1'
-#EOF
+uci -q batch <<-EOF >/dev/null
+	set firewall.zone_lan.mtu_fix='1'
+	set firewall.zone_vpn.mtu_fix='1'
+EOF
 uci -q batch <<-EOF >/dev/null
 	set firewall.@include[0].reload='1'
 	commit firewall