diff --git a/nimble/controller/src/ble_ll_iso_big.c b/nimble/controller/src/ble_ll_iso_big.c
index d4a492b296..b07e5c1d86 100644
--- a/nimble/controller/src/ble_ll_iso_big.c
+++ b/nimble/controller/src/ble_ll_iso_big.c
@@ -1302,9 +1302,9 @@ ble_ll_iso_big_hci_create(const uint8_t *cmdbuf, uint8_t len)
     /* FIXME for now we only care about retransmissions, so set both NSE and IRC
      * to RTN
      */
-    bp.nse = MIN(cmd->rtn, 0x0f);;
+    bp.nse = MIN(cmd->rtn + 1, 0x0f);;
     bp.bn = 1;
-    bp.irc = MIN(cmd->rtn, 0x0f);
+    bp.irc = MIN(cmd->rtn + 1, 0x0f);
     bp.pto = 0;
     bp.iso_interval = bp.sdu_interval / 1250;
     bp.max_pdu = bp.max_sdu;