diff --git a/modules/vlan/service.nix b/modules/vlan/service.nix
index 4b30cd9..01f3805 100644
--- a/modules/vlan/service.nix
+++ b/modules/vlan/service.nix
@@ -10,6 +10,9 @@ in oneshot rec {
   up = ''
     ip link add link $(output ${primary} ifname) name ${ifname} type vlan id ${vid}
     ${liminix.networking.ifup name ifname}
+    (in_outputs ${name}
+     echo ${ifname} > ifname
+    )
   '';
   down = "ip link set down dev ${ifname}";
 }