diff --git a/src/db.cc b/src/db.cc
index 02c9a8def..26decaa26 100644
--- a/src/db.cc
+++ b/src/db.cc
@@ -54,8 +54,9 @@ void DB::DoBgSave(const std::string& path, int i) {
 }
 
 void DB::CreateCheckpoint(const std::string& path) {
-  if (0 != pstd::CreatePath(path + '/' + std::to_string(db_index_))) {
-    WARN("Create dir {} fail !", path + '/' + std::to_string(db_index_));
+  auto tmp_path = path + '/' + std::to_string(db_index_);
+  if (0 != pstd::CreatePath(tmp_path)) {
+    WARN("Create dir {} fail !", tmp_path);
     return;
   }
   checkpoint_manager_->CreateCheckpoint(path);
diff --git a/src/praft/praft.cc b/src/praft/praft.cc
index 3fd14fa3d..37b5e7dcf 100644
--- a/src/praft/praft.cc
+++ b/src/praft/praft.cc
@@ -373,6 +373,7 @@ void PRaft::AppendLog(const Binlog& log, std::promise<rocksdb::Status>&& promise
 }
 
 void PRaft::add_all_files(const std::filesystem::path& dir, braft::SnapshotWriter* writer, const std::string& path) {
+  assert(writer);
   for (const auto& entry : std::filesystem::directory_iterator(dir)) {
     if (entry.is_directory()) {
       if (entry.path() != "." && entry.path() != "..") {
@@ -390,7 +391,7 @@ void PRaft::add_all_files(const std::filesystem::path& dir, braft::SnapshotWrite
 
 void PRaft::recursive_copy(const std::filesystem::path& source, const std::filesystem::path& destination) {
   if (std::filesystem::is_regular_file(source)) {
-    if (source.filename() == "__raft_snapshot_meta") {
+    if (source.filename() == PBRAFT_SNAPSHOT_META_FILE) {
       return;
     } else if (source.extension() == ".sst") {
       // Create a hard link
diff --git a/src/praft/praft.h b/src/praft/praft.h
index 1670b2ccf..91b392af4 100644
--- a/src/praft/praft.h
+++ b/src/praft/praft.h
@@ -20,6 +20,7 @@
 namespace pikiwidb {
 
 #define RAFT_DBID_LEN 32
+#define PBRAFT_SNAPSHOT_META_FILE "__raft_snapshot_meta"
 
 #define PRAFT PRaft::Instance()