diff --git a/test/lwt/echo_client.ml b/test/lwt/echo_client.ml
index a25a9ba1..25a05b37 100644
--- a/test/lwt/echo_client.ml
+++ b/test/lwt/echo_client.ml
@@ -101,7 +101,17 @@ let () =
   in
   Arg.parse opts ignore "echo client";
 
-  (* Lwt_engine.set @@ new Lwt_engine.libev (); *)
-  M_lwt.lwt_main @@ fun _runner ->
-  main ~port:!port ~n:!n ~n_conn:!n_conn ~verbose:!verbose
-    ~msg_per_conn:!msg_per_conn ()
+  let main () =
+    (* Lwt_engine.set @@ new Lwt_engine.libev (); *)
+    M_lwt.lwt_main @@ fun _runner ->
+    main ~port:!port ~n:!n ~n_conn:!n_conn ~verbose:!verbose
+      ~msg_per_conn:!msg_per_conn ()
+  in
+
+  print_endline "first run";
+  main ();
+  assert (not (M_lwt.is_setup ()));
+  print_endline "second run";
+  main ();
+  assert (not (M_lwt.is_setup ()));
+  print_endline "done"
diff --git a/test/lwt/output_echo.expected b/test/lwt/output_echo.expected
index 5fdaef5d..a1b20abf 100644
--- a/test/lwt/output_echo.expected
+++ b/test/lwt/output_echo.expected
@@ -2,7 +2,21 @@ run echo server on port=12346
 listening on port 12346
 run echo client -p 12346 -n 10 --n-conn=2 -v
 all done
+all done
 connecting to port 12346 (10 msg per conn, 10 conns total, 2 max at a time)
+connecting to port 12346 (10 msg per conn, 10 conns total, 2 max at a time)
+done
+first run
+read: hello 1
+read: hello 1
+read: hello 1
+read: hello 1
+read: hello 1
+read: hello 1
+read: hello 1
+read: hello 1
+read: hello 1
+read: hello 1
 read: hello 1
 read: hello 1
 read: hello 1
@@ -23,6 +37,26 @@ read: hello 10
 read: hello 10
 read: hello 10
 read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 10
+read: hello 2
+read: hello 2
+read: hello 2
+read: hello 2
+read: hello 2
+read: hello 2
+read: hello 2
+read: hello 2
+read: hello 2
+read: hello 2
 read: hello 2
 read: hello 2
 read: hello 2
@@ -43,6 +77,26 @@ read: hello 3
 read: hello 3
 read: hello 3
 read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 3
+read: hello 4
+read: hello 4
+read: hello 4
+read: hello 4
+read: hello 4
+read: hello 4
+read: hello 4
+read: hello 4
+read: hello 4
+read: hello 4
 read: hello 4
 read: hello 4
 read: hello 4
@@ -63,6 +117,26 @@ read: hello 5
 read: hello 5
 read: hello 5
 read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 5
+read: hello 6
+read: hello 6
+read: hello 6
+read: hello 6
+read: hello 6
+read: hello 6
+read: hello 6
+read: hello 6
+read: hello 6
+read: hello 6
 read: hello 6
 read: hello 6
 read: hello 6
@@ -83,6 +157,26 @@ read: hello 7
 read: hello 7
 read: hello 7
 read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 7
+read: hello 8
+read: hello 8
+read: hello 8
+read: hello 8
+read: hello 8
+read: hello 8
+read: hello 8
+read: hello 8
+read: hello 8
+read: hello 8
 read: hello 8
 read: hello 8
 read: hello 8
@@ -103,3 +197,14 @@ read: hello 9
 read: hello 9
 read: hello 9
 read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+read: hello 9
+second run