diff --git a/src/echo.cpp b/src/echo.cpp
index de80565..65bc098 100644
--- a/src/echo.cpp
+++ b/src/echo.cpp
@@ -21,6 +21,7 @@
 #include "exception.h"
 
 #include <sys/socket.h>
+#include <sys/types.h>
 #include <netinet/in_systm.h>
 #include <netinet/in.h>
 #include <netinet/ip.h>
diff --git a/src/tun.cpp b/src/tun.cpp
index 26c6b90..ff3d4bc 100644
--- a/src/tun.cpp
+++ b/src/tun.cpp
@@ -22,6 +22,7 @@
 #include "utility.h"
 
 #include <arpa/inet.h>
+#include <sys/types.h>
 #include <netinet/in_systm.h>
 #include <netinet/in.h>
 #include <netinet/ip.h>