diff --git a/myis11/src/IRIS_IS3/SensorIS3.cpp b/myis11/src/IRIS_IS3/SensorIS3.cpp
index 2f78865..bd67f1f 100644
--- a/myis11/src/IRIS_IS3/SensorIS3.cpp
+++ b/myis11/src/IRIS_IS3/SensorIS3.cpp
@@ -5,6 +5,8 @@
 #include "iostream"
 #include "IRIS_Method.h"
 
+#include <string>
+
 static void split(const std::string& s, std::vector<std::string>& sv, char flag)
 {
     sv.clear();