diff --git a/AttysCommBase.h b/AttysCommBase.h
index 7adb3e3..90e0948 100644
--- a/AttysCommBase.h
+++ b/AttysCommBase.h
@@ -5,9 +5,11 @@
 #define _CRT_SECURE_NO_WARNINGS
 
 #include <string.h>
+#include <string>
 #include <thread>
 #include <math.h>
 #include <mutex>
+#include <cstdio>
 
 #include "attyscomm/base64.h"