diff --git a/deploy/wizwar-rollup.sh b/deploy/wizwar-rollup.sh
index 6d481e4..95461ef 100755
--- a/deploy/wizwar-rollup.sh
+++ b/deploy/wizwar-rollup.sh
@@ -65,6 +65,8 @@ for f in glob.glob("/var/lib/wizwar/rooms/*.jsonl"):
             ct = datetime.datetime.fromisoformat(ca.replace("Z", "+00:00")).timestamp()
             if not (t0 <= ct < t1): continue
             new_rooms += 1
+            # The host takes the first seat by creating; only others join.
+            if meta.get("hostId"): seats[meta["hostId"]] += 1
             for line in fh:
                 try: r = json.loads(line)
                 except ValueError: continue