diff --git a/src/hostnet/mux.ml b/src/hostnet/mux.ml
index 6d8889774..0a7146a63 100644
--- a/src/hostnet/mux.ml
+++ b/src/hostnet/mux.ml
@@ -67,6 +67,7 @@ module Make (Netif: Mirage_net_lwt.S) = struct
   let remove t rule =
     Log.debug (fun f ->
         f "removing switch port for %s" (Ipaddr.V4.to_string rule));
+    disconnect t;
     t.rules <- RuleMap.remove rule t.rules
 
   let callback t buf =