diff --git a/app/benches/db_bench.rs b/app/benches/db_bench.rs
index ca0f06c..8c49a84 100644
--- a/app/benches/db_bench.rs
+++ b/app/benches/db_bench.rs
@@ -7,12 +7,12 @@ extern crate serde_json;
 extern crate tempfile;
 
 use chgk_ledb_lib::db;
-use std::path::PathBuf;
+use std::path::Path;
 
 use db::{Reader, Writer, WriterOpts};
 
 use criterion::{BatchSize, Criterion};
-use tempfile::tempdir;
+use tempfile::{tempdir, NamedTempFile};
 
 use serde_derive::{Deserialize, Serialize};
 
@@ -37,17 +37,14 @@ struct TestData {
 const N: usize = 4096;
 
 fn gen_data(count: usize) -> impl Iterator<Item = TestData> {
-    (0..count)
-        .into_iter()
-        .map(|i| 143 + i as u64)
-        .map(|i| TestData {
-            num1: i,
-            num2: i * 100 ^ 0xDF0E441122334455,
-            test: "test ---- Test ____".repeat(123 + i as usize % 15),
-        })
+    (0..count).map(|i| 143 + i as u64).map(|i| TestData {
+        num1: i,
+        num2: (i * 100) ^ 0xDF0E441122334455,
+        test: "test ---- Test ____".repeat(123 + i as usize % 15),
+    })
 }
 
-fn prepare_db_writer(path: &PathBuf) -> Writer<TestData> {
+fn prepare_db_writer<P: AsRef<Path>>(path: P) -> Writer<TestData> {
     let opts = WriterOpts {
         compress_lvl: 1,
         data_buf_size: 100 * 1024 * 1024,
@@ -60,7 +57,9 @@ fn prepare_db_writer(path: &PathBuf) -> Writer<TestData> {
 
 fn db_read(c: &mut Criterion) {
     let dir = tempdir().expect("tempdir");
-    let tmpfile = dir.path().join("test.tmp");
+    let tmpfile = NamedTempFile::new_in(dir.path())
+        .expect("new tempfile")
+        .into_temp_path();
     let mut writer = prepare_db_writer(&tmpfile);
 
     let mut items_iter = gen_data(N).collect::<Vec<TestData>>().into_iter();
@@ -85,10 +84,13 @@ fn db_read(c: &mut Criterion) {
 
 fn db_write(c: &mut Criterion) {
     let dir = tempdir().expect("tempdir");
-    let tmpfile = dir.path().join("test.tmp");
+
     c.bench_function("write", |b| {
         b.iter_batched(
             || {
+                let tmpfile = NamedTempFile::new_in(dir.path())
+                    .expect("new tempfile")
+                    .into_temp_path();
                 let src = gen_data(N).collect::<Vec<TestData>>().into_iter();
                 let writer = prepare_db_writer(&tmpfile);
                 (src, writer)