diff --git a/sample_cc/hub/lds_hub.h b/sample_cc/hub/lds_hub.h
index 3d17590..d8fca84 100644
--- a/sample_cc/hub/lds_hub.h
+++ b/sample_cc/hub/lds_hub.h
@@ -29,6 +29,7 @@
 
 #include <memory>
 #include <vector>
+#include <string>
 
 #include "livox_def.h"
 #include "livox_sdk.h"
diff --git a/sample_cc/lidar/lds_lidar.h b/sample_cc/lidar/lds_lidar.h
index 0f250b1..da80d2d 100644
--- a/sample_cc/lidar/lds_lidar.h
+++ b/sample_cc/lidar/lds_lidar.h
@@ -29,6 +29,7 @@
 
 #include <memory>
 #include <vector>
+#include <string>
 
 #include "livox_def.h"
 #include "livox_sdk.h"
diff --git a/sample_cc/lidar_utc_sync/lds_lidar.h b/sample_cc/lidar_utc_sync/lds_lidar.h
index a56415e..b74ab38 100644
--- a/sample_cc/lidar_utc_sync/lds_lidar.h
+++ b/sample_cc/lidar_utc_sync/lds_lidar.h
@@ -29,6 +29,7 @@
 
 #include <memory>
 #include <vector>
+#include <string>
 
 #include "livox_def.h"
 #include "livox_sdk.h"
diff --git a/sample_cc/lidar_utc_sync/synchro.h b/sample_cc/lidar_utc_sync/synchro.h
index 9d5386a..e444e0d 100644
--- a/sample_cc/lidar_utc_sync/synchro.h
+++ b/sample_cc/lidar_utc_sync/synchro.h
@@ -30,6 +30,7 @@
 #include <memory>
 #include <thread>
 #include <vector>
+#include <string>
 #include <functional>
 #ifdef WIN32
 #include <Windows.h>