diff --git a/core/src/db/meta/MySQLMetaImpl.cpp b/core/src/db/meta/MySQLMetaImpl.cpp
index 4eafd6b9ecec5751982b7c9f12d9e7b514d835a8..c7a054524c241456a05e83e5481e75c540a4e773 100644
--- a/core/src/db/meta/MySQLMetaImpl.cpp
+++ b/core/src/db/meta/MySQLMetaImpl.cpp
@@ -173,7 +173,7 @@ MySQLMetaImpl::~MySQLMetaImpl() {
 
 Status
 MySQLMetaImpl::NextTableId(std::string& table_id) {
-    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
+    std::lock_guard<std::mutex> lock(genid_mutex_);  // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();
@@ -183,7 +183,7 @@ MySQLMetaImpl::NextTableId(std::string& table_id) {
 
 Status
 MySQLMetaImpl::NextFileId(std::string& file_id) {
-    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
+    std::lock_guard<std::mutex> lock(genid_mutex_);  // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();
diff --git a/core/src/db/meta/SqliteMetaImpl.cpp b/core/src/db/meta/SqliteMetaImpl.cpp
index 0454123acdfb359d21550970badfcd2229eefe47..4123858b4409b3df71f66eab373db64fe0a23be5 100644
--- a/core/src/db/meta/SqliteMetaImpl.cpp
+++ b/core/src/db/meta/SqliteMetaImpl.cpp
@@ -97,7 +97,7 @@ SqliteMetaImpl::~SqliteMetaImpl() {
 
 Status
 SqliteMetaImpl::NextTableId(std::string &table_id) {
-    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
+    std::lock_guard<std::mutex> lock(genid_mutex_);  // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();
@@ -107,7 +107,7 @@ SqliteMetaImpl::NextTableId(std::string &table_id) {
 
 Status
 SqliteMetaImpl::NextFileId(std::string &file_id) {
-    std::lock_guard<std::mutex> lock(genid_mutex_); // avoid duplicated id
+    std::lock_guard<std::mutex> lock(genid_mutex_);  // avoid duplicated id
     std::stringstream ss;
     SimpleIDGenerator g;
     ss << g.GetNextIDNumber();