diff --git a/src/server/hotspot_partition_calculator.cpp b/src/server/hotspot_partition_calculator.cpp
index 7f8920ff5d..59ffce7b63 100644
--- a/src/server/hotspot_partition_calculator.cpp
+++ b/src/server/hotspot_partition_calculator.cpp
@@ -84,7 +84,7 @@ void hotspot_partition_calculator::init_perf_counter(int partition_count)
 {
     for (int data_type = 0; data_type <= 1; data_type++) {
         for (int i = 0; i < partition_count; i++) {
-            string partition_desc =
+            std::string partition_desc =
                 _app_name + '.' +
                 (data_type == partition_qps_type::WRITE_HOTSPOT_DATA ? "write." : "read.") +
                 std::to_string(i);
@@ -95,7 +95,7 @@ void hotspot_partition_calculator::init_perf_counter(int partition_count)
                 "app.pegasus", counter_name.c_str(), COUNTER_TYPE_NUMBER, counter_desc.c_str());
         }
 
-        string total_desc =
+        std::string total_desc =
             _app_name + '.' +
             (data_type == partition_qps_type::WRITE_HOTSPOT_DATA ? "write.total" : "read.total");
         std::string counter_name = fmt::format("app.stat.hotspots.{}", total_desc);
diff --git a/src/server/info_collector.h b/src/server/info_collector.h
index 32c5baed91..649d0dee09 100644
--- a/src/server/info_collector.h
+++ b/src/server/info_collector.h
@@ -232,7 +232,7 @@ class info_collector
     ::dsn::task_ptr _storage_size_stat_timer_task;
     ::dsn::utils::ex_lock_nr _capacity_unit_update_info_lock;
     // mapping 'node address' --> 'last updated timestamp'
-    std::map<std::string, string> _capacity_unit_update_info;
+    std::map<std::string, std::string> _capacity_unit_update_info;
     // _hotspot_calculator_store is to save hotspot_partition_calculator for each table, a
     // hotspot_partition_calculator saves historical hotspot data and alert perf_counters of
     // corresponding table