diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index a13b8f37fa..109b4faf20 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -1225,7 +1225,7 @@ 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 < 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],
+            atxlev[aa] = signal_energy((int32_t*)&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);
 
             txlev_sum += atxlev[aa];