diff --git a/src/vmm_asn.ml b/src/vmm_asn.ml
index 3e28d54..9baf329 100644
--- a/src/vmm_asn.ml
+++ b/src/vmm_asn.ml
@@ -192,6 +192,7 @@ let log_event =
         | `C3 n -> `Stop n
       in
       `Unikernel_stop (to_name name, pid, status')
+    | `C6 () -> `Hup
   and g = function
     | `Startup -> `C1 ()
     | `Login (name, ip, port) -> `C2 (of_name name, ip, port)
@@ -204,6 +205,7 @@ let log_event =
         | `Stop n -> `C3 n
       in
       `C5 (of_name name, pid, status')
+    | `Hup -> `C6 ()
   in
   let endp =
     Asn.S.(sequence3
@@ -212,7 +214,7 @@ let log_event =
             (required ~label:"port" int))
   in
   Asn.S.map f g @@
-  Asn.S.(choice5
+  Asn.S.(choice6
            (explicit 0 null)
            (explicit 1 endp)
            (explicit 2 endp)
@@ -227,7 +229,8 @@ let log_event =
                           (required ~label:"status" (choice3
                                                        (explicit 0 int)
                                                        (explicit 1 int)
-                                                       (explicit 2 int))))))
+                                                       (explicit 2 int)))))
+           (explicit 5 null))
 
 let log_cmd =
   let f = function
diff --git a/src/vmm_core.ml b/src/vmm_core.ml
index 71d0000..ac86641 100644
--- a/src/vmm_core.ml
+++ b/src/vmm_core.ml
@@ -266,6 +266,7 @@ module Log = struct
     | `Startup
     | `Unikernel_start of Name.t * int * string list * string option
     | `Unikernel_stop of Name.t * int * process_exit
+    | `Hup
   ]
 
   let name = function
@@ -274,9 +275,10 @@ module Log = struct
     | `Logout (name, _, _) -> name
     | `Unikernel_start (name, _, _ ,_) -> name
     | `Unikernel_stop (name, _, _) -> name
+    | `Hup -> []
 
   let pp_log_event ppf = function
-    | `Startup -> Fmt.(pf ppf "startup")
+    | `Startup -> Fmt.string ppf "startup"
     | `Login (name, ip, port) -> Fmt.pf ppf "%a login %a:%d" Name.pp name Ipaddr.V4.pp_hum ip port
     | `Logout (name, ip, port) -> Fmt.pf ppf "%a logout %a:%d" Name.pp name Ipaddr.V4.pp_hum ip port
     | `Unikernel_start (name, pid, taps, block) ->
@@ -285,6 +287,8 @@ module Log = struct
         Fmt.(option ~none:(unit "no") string) block
     | `Unikernel_stop (name, pid, code) ->
       Fmt.pf ppf "%a stopped %d with %a" Name.pp name pid pp_process_exit code
+    | `Hup -> Fmt.string ppf "hup"
+
 
   type t = Ptime.t * log_event
 
diff --git a/src/vmm_core.mli b/src/vmm_core.mli
index e494363..7a18b9f 100644
--- a/src/vmm_core.mli
+++ b/src/vmm_core.mli
@@ -141,7 +141,9 @@ module Log : sig
     | `Logout of Name.t * Ipaddr.V4.t * int
     | `Startup
     | `Unikernel_start of Name.t * int * string list * string option
-    | `Unikernel_stop of Name.t * int * process_exit ]
+    | `Unikernel_stop of Name.t * int * process_exit
+    | `Hup
+  ]
 
   val name : log_event -> Name.t