diff --git a/auth.h b/auth.h
index ce47638..b49ec59 100644
--- a/auth.h
+++ b/auth.h
@@ -23,6 +23,7 @@
 #include <vector>
 #include <string>
 #include <string.h>
+#include <stdint.h>
 
 class Auth
 {
diff --git a/tun.cpp b/tun.cpp
index b5dd6d8..2b47101 100644
--- a/tun.cpp
+++ b/tun.cpp
@@ -29,6 +29,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <stdio.h>
 
 typedef ip IpHeader;
 
diff --git a/utility.cpp b/utility.cpp
index bfc1c9e..edd3d03 100644
--- a/utility.cpp
+++ b/utility.cpp
@@ -20,6 +20,7 @@
 #include "utility.h"
 
 #include <stdlib.h>
+#include <stdio.h>
 
 using namespace std;
 
diff --git a/utility.h b/utility.h
index d9b09f7..d397040 100644
--- a/utility.h
+++ b/utility.h
@@ -21,6 +21,7 @@
 #define UTILITY_H
 
 #include <string>
+#include <stdint.h>
 
 class Utility
 {