diff --git a/openair1/PHY/NR_UE_TRANSPORT/dci_nr.c b/openair1/PHY/NR_UE_TRANSPORT/dci_nr.c
index 5293d13f90..b4c10d373f 100644
--- a/openair1/PHY/NR_UE_TRANSPORT/dci_nr.c
+++ b/openair1/PHY/NR_UE_TRANSPORT/dci_nr.c
@@ -686,7 +686,7 @@ int32_t nr_rx_pdcch(PHY_VARS_NR_UE *ue,
   get_coreset_rballoc(rel15->coreset.frequency_domain_resource,&n_rb,&rb_offset);
 
   // Pointers to extracted PDCCH symbols in frequency-domain.
-  int32_t rx_size = 4*n_rb*12;
+  int32_t rx_size = ((4 * frame_parms->N_RB_DL * 12 + 31) >> 5) << 5;
   __attribute__ ((aligned(32))) int32_t rxdataF_ext[frame_parms->nb_antennas_rx][rx_size];
   __attribute__ ((aligned(32))) int32_t rxdataF_comp[frame_parms->nb_antennas_rx][rx_size];
   __attribute__ ((aligned(32))) int32_t pdcch_dl_ch_estimates_ext[frame_parms->nb_antennas_rx][rx_size];