diff --git a/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c b/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
index 9d611fbcba..ece301db81 100644
--- a/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
+++ b/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
@@ -226,7 +226,7 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
   /////////////////////////PTRS parameters' initialization/////////////////////////
   ///////////
 
-  int16_t mod_ptrs[(nb_rb/2)*(NR_SYMBOLS_PER_SLOT-1)*2]; // assume maximum number of PTRS per pusch allocation
+  int16_t mod_ptrs[nb_rb] __attribute((aligned(16))); // assume maximum number of PTRS per pusch allocation
   K_ptrs = 0; // just to avoid a warning
 
   if (harq_process_ul_ue->pusch_pdu.pdu_bit_map & PUSCH_PDU_BITMAP_PUSCH_PTRS) {