diff --git a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c
index a2e066d8c5..bc1b6737f3 100644
--- a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c
+++ b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c
@@ -1106,7 +1106,7 @@ bool nr_fr1_ulsch_preprocessor(module_id_t module_id, frame_t frame, sub_frame_t
   int K2 = get_K2(sched_ctrl->active_ubwp, tda, mu);
   const int sched_frame = frame + (slot + K2 >= nr_slots_per_frame[mu]);
   const int sched_slot = (slot + K2) % nr_slots_per_frame[mu];
-  if (!is_xlsch_in_slot(nr_mac->ulsch_slot_bitmap[slot / 64], sched_slot))
+  if (!is_xlsch_in_slot(nr_mac->ulsch_slot_bitmap[sched_slot / 64], sched_slot))
     return false;
 
   sched_ctrl->sched_pusch.slot = sched_slot;