diff --git a/executables/nr-gnb.c b/executables/nr-gnb.c
index 95b983190e..8efaad22ee 100644
--- a/executables/nr-gnb.c
+++ b/executables/nr-gnb.c
@@ -433,7 +433,8 @@ void init_gNB_Tpool(int inst) {
   initNotifiedFIFO(gNB->resp_RU_tx);
   notifiedFIFO_elt_t *msgRUTx = newNotifiedFIFO_elt(sizeof(processingData_RU_t),0,gNB->resp_RU_tx,ru_tx_func);
   processingData_RU_t *msgData = (processingData_RU_t*)msgRUTx->msgData;
-  msgData->next_slot = sf_ahead*gNB->frame_parms.slots_per_subframe; // first Tx slot
+  int first_tx_slot = sf_ahead*gNB->frame_parms.slots_per_subframe;
+  msgData->next_slot = get_next_downlink_slot(gNB, &gNB->gNB_config, 0, first_tx_slot-1);
   pushNotifiedFIFO(gNB->resp_RU_tx,msgRUTx); // to unblock the process in the beginning
 
   // Stats measurement thread