diff --git a/src/cli.c b/src/cli.c
index 3aa5f230b..23ab57b73 100644
--- a/src/cli.c
+++ b/src/cli.c
@@ -1068,7 +1068,7 @@ static int cli_io_handler_show_activity(struct appctx *appctx)
 
 	chunk_reset(&trash);
 
-	chunk_appendf(&trash, "thread_id: %u", tid);
+	chunk_appendf(&trash, "thread_id: %u (%u..%u)", tid + 1, 1, global.nbthread);
 	chunk_appendf(&trash, "\ndate_now: %lu.%06lu", (long)now.tv_sec, (long)now.tv_usec);
 	chunk_appendf(&trash, "\nloops:");        for (thr = 0; thr < global.nbthread; thr++) chunk_appendf(&trash, " %u", activity[thr].loops);
 	chunk_appendf(&trash, "\nwake_cache:");   for (thr = 0; thr < global.nbthread; thr++) chunk_appendf(&trash, " %u", activity[thr].wake_cache);