diff --git a/sts/tcp_server.c b/sts/tcp_server.c
index baa2459..9c10bb4 100644
--- a/sts/tcp_server.c
+++ b/sts/tcp_server.c
@@ -5,6 +5,8 @@
 #include <netdb.h>
 #include <memory.h>
 #include <errno.h>
+#include <arpa/inet.h>
+#include <unistd.h>
 #include "common.h"
 
 /*Server process is running on this port no. Client has to send data to this port no*/