diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index 3d16eeaa2f..6521324bec 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -1224,7 +1224,7 @@ int main(int argc, char **argv)
         ////////////////////////////////////////////////////
         tx_offset = frame_parms->get_samples_slot_timestamp(slot,frame_parms,0);
         txlev_sum = 0;
-        for (int aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
+        for (int aa=0; aa<UE->frame_parms.nb_antennas_tx; aa++) {
           atxlev[aa] = signal_energy(&UE->common_vars.txdata[aa][tx_offset + 5*frame_parms->ofdm_symbol_size + 4*frame_parms->nb_prefix_samples + frame_parms->nb_prefix_samples0],
                               frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples);