diff --git a/pretalx_broadcast_tools/static/pretalx_broadcast_tools/room_timer.js b/pretalx_broadcast_tools/static/pretalx_broadcast_tools/room_timer.js
index bcc50c9..1e2729e 100644
--- a/pretalx_broadcast_tools/static/pretalx_broadcast_tools/room_timer.js
+++ b/pretalx_broadcast_tools/static/pretalx_broadcast_tools/room_timer.js
@@ -61,7 +61,7 @@ function update_room_info() {
             progressbar_bar.style.width = '0';
             timehint.innerHTML = '';
         } else if (scheduled_end < now) {
-            timeleft.innerHTML = '0sec';
+            timeleft.innerHTML = '0:00';
             progressbar_bar.style.width = '100vw';
             timehint.innerHTML = 'talk has ended';
         } else {