diff --git a/I2CController.h b/I2CController.h
index 14bc81e..281c587 100644
--- a/I2CController.h
+++ b/I2CController.h
@@ -24,6 +24,8 @@
 
 #include "SerialPort.h"
 
+#include <string>
+
 class CI2CController : public ISerialPort {
 public:
 	CI2CController(const std::string& device, unsigned int address = 0x22U);