if (iwl_mvm_has_new_rx_api(mvm)) {
                op_mode->ops = &iwl_mvm_ops_mq;
+               trans->rx_mpdu_cmd_hdr_size = sizeof(struct iwl_rx_mpdu_desc);
        } else {
                op_mode->ops = &iwl_mvm_ops;
+               trans->rx_mpdu_cmd_hdr_size =
+                       sizeof(struct iwl_rx_mpdu_res_start);
 
                if (WARN_ON(trans->num_rx_queues > 1))
                        goto out_free;
        iwl_trans_configure(mvm->trans, &trans_cfg);
 
        trans->rx_mpdu_cmd = REPLY_RX_MPDU_CMD;
-       trans->rx_mpdu_cmd_hdr_size = sizeof(struct iwl_rx_mpdu_res_start);
        trans->dbg_dest_tlv = mvm->fw->dbg_dest_tlv;
        trans->dbg_dest_reg_num = mvm->fw->dbg_dest_reg_num;
        memcpy(trans->dbg_conf_tlv, mvm->fw->dbg_conf_tlv,