diff --git a/apps/bap_broadcast_source.py b/apps/bap_broadcast_source.py
index ac426fb..b72660b 100644
--- a/apps/bap_broadcast_source.py
+++ b/apps/bap_broadcast_source.py
@@ -885,6 +885,8 @@ async def run_broadcast(
             global iso_index
             big.bis_links[0].write(frames[iso_index])
             iso_index +=1
+            if iso_index == len(frames): 
+                iso_index = 0
 
 
         device.host.on('packet_complete',on_iso_pdu_sent)