diff --git a/openair1/SIMULATION/NR_PHY/pucchsim.c b/openair1/SIMULATION/NR_PHY/pucchsim.c
index b3a6f112e7..a3eb4452d7 100644
--- a/openair1/SIMULATION/NR_PHY/pucchsim.c
+++ b/openair1/SIMULATION/NR_PHY/pucchsim.c
@@ -504,6 +504,7 @@ int main(int argc, char **argv)
     pucch_tx_pdu.start_symbol_index = startingSymbolIndex;
     pucch_tx_pdu.bwp_start = 0;
     pucch_tx_pdu.prb_start = startingPRB;
+    pucch_tx_pdu.prb_size = nrofPRB;
     pucch_tx_pdu.hopping_id = hopping_id;
     pucch_tx_pdu.group_hop_flag = 0;
     pucch_tx_pdu.sequence_hop_flag = 0;