diff --git a/src/modbus-rtu.c b/src/modbus-rtu.c
index 34441a1..a284e14 100644
--- a/src/modbus-rtu.c
+++ b/src/modbus-rtu.c
@@ -18,7 +18,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
-#include <termios.h>
 #include <fcntl.h>
 #include <string.h>
 
diff --git a/src/modbus-tcp.c b/src/modbus-tcp.c
index 04af558..85d04f5 100644
--- a/src/modbus-tcp.c
+++ b/src/modbus-tcp.c
@@ -23,13 +23,6 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>
-#if (defined OpenBSD) || (defined(__FreeBSD__ ) && __FreeBSD__ < 5)
-#include <netinet/in_systm.h>
-#endif
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <netinet/tcp.h>
-#include <arpa/inet.h>
 
 #include "modbus.h"
 #include "modbus-private.h"
diff --git a/src/modbus.c b/src/modbus.c
index df1f43b..7a3198e 100644
--- a/src/modbus.c
+++ b/src/modbus.c
@@ -22,21 +22,10 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
-#include <stdint.h>
-#include <termios.h>
 #include <unistd.h>
 #include <errno.h>
 #include <limits.h>
 
-/* Add this for macros that defined unix flavor */
-#if (defined(__unix__) || defined(unix)) && !defined(USG)
-#include <sys/param.h>
-#endif
-
-#if !defined(UINT16_MAX)
-#define UINT16_MAX 0xFFFF
-#endif
-
 #include "modbus.h"
 #include "modbus-private.h"