diff --git a/openair2/F1AP/lib/f1ap_interface_management.c b/openair2/F1AP/lib/f1ap_interface_management.c
index 32a1f28b58..5767a06d95 100644
--- a/openair2/F1AP/lib/f1ap_interface_management.c
+++ b/openair2/F1AP/lib/f1ap_interface_management.c
@@ -2107,8 +2107,12 @@ f1ap_gnb_du_configuration_update_acknowledge_t cp_f1ap_du_configuration_update_a
   for (int i = 0; i < cp.num_cells_to_activate; i++) {
     cp.cells_to_activate[i] = msg->cells_to_activate[i];
     for (int s = 0; s < cp.cells_to_activate[i].num_SI; s++) {
-      cp.cells_to_activate[i].SI_msg[s].SI_container = calloc_or_fail(1, sizeof(*cp.cells_to_activate[i].SI_msg[s].SI_container));
-      *cp.cells_to_activate[i].SI_msg[s].SI_container = *msg->cells_to_activate[i].SI_msg[s].SI_container;
+      f1ap_sib_msg_t *cp_sib = &cp.cells_to_activate[i].SI_msg[s];
+      const f1ap_sib_msg_t *msg_sib = &msg->cells_to_activate[i].SI_msg[s];
+      cp_sib->SI_type = msg_sib->SI_type;
+      cp_sib->SI_container_length = msg_sib->SI_container_length;
+      cp_sib->SI_container = calloc_or_fail(cp_sib->SI_container_length, sizeof(*cp_sib->SI_container));
+      memcpy(cp_sib->SI_container, msg_sib->SI_container, cp_sib->SI_container_length);
     }
   }
   return cp;