diff --git a/subsys/bluetooth/controller/ll_sw/ull_sched.c b/subsys/bluetooth/controller/ll_sw/ull_sched.c
index 76e16036b0b..b8c944e0d06 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_sched.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_sched.c
@@ -101,8 +101,8 @@ int ull_sched_adv_aux_sync_free_slot_get(uint8_t user_id,
 			if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT)) {
 				const struct ll_adv_aux_set *aux;
 
-				aux = (void *)ull_hdr_get_cb(ticker_id,
-							     &ticks_slot);
+				aux = ull_adv_aux_get(ticker_id -
+						      TICKER_ID_ADV_AUX_BASE);
 				*ticks_anchor +=
 					MAX(aux->ull.ticks_active_to_start,
 					    aux->ull.ticks_prepare_to_start);
@@ -119,8 +119,8 @@ int ull_sched_adv_aux_sync_free_slot_get(uint8_t user_id,
 			if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT)) {
 				const struct ll_adv_sync_set *sync;
 
-				sync = (void *)ull_hdr_get_cb(ticker_id,
-							      &ticks_slot);
+				sync = ull_adv_sync_get(ticker_id -
+							TICKER_ID_ADV_SYNC_BASE);
 				*ticks_anchor +=
 					MAX(sync->ull.ticks_active_to_start,
 					    sync->ull.ticks_prepare_to_start);
@@ -137,8 +137,8 @@ int ull_sched_adv_aux_sync_free_slot_get(uint8_t user_id,
 			if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT)) {
 				const struct ll_adv_iso_set *iso;
 
-				iso = (void *)ull_hdr_get_cb(ticker_id,
-							     &ticks_slot);
+				iso = ull_adv_iso_get(ticker_id -
+						      TICKER_ID_ADV_ISO_BASE);
 				*ticks_anchor +=
 					MAX(iso->ull.ticks_active_to_start,
 					    iso->ull.ticks_prepare_to_start);