diff --git a/src/common.h b/src/common.h
index f224cced..1894568f 100644
--- a/src/common.h
+++ b/src/common.h
@@ -37,6 +37,10 @@
 
 #endif
 
+#ifndef SOL_TCP
+#define SOL_TCP IPPROTO_TCP
+#endif
+
 int init_udprelay(const char *server_host, const char *server_port,
 #ifdef UDPRELAY_LOCAL
                   const struct sockaddr *remote_addr, const int remote_addr_len,
diff --git a/src/local.c b/src/local.c
index 21069c3c..fc963cab 100644
--- a/src/local.c
+++ b/src/local.c
@@ -63,9 +63,9 @@
 
 #include "netutils.h"
 #include "utils.h"
-#include "local.h"
 #include "socks5.h"
 #include "acl.h"
+#include "local.h"
 
 #ifndef EAGAIN
 #define EAGAIN EWOULDBLOCK
diff --git a/src/udprelay.c b/src/udprelay.c
index bd3d0685..5f49656c 100644
--- a/src/udprelay.c
+++ b/src/udprelay.c
@@ -57,8 +57,8 @@
 #include <udns.h>
 
 #include "utils.h"
-#include "udprelay.h"
 #include "cache.h"
+#include "udprelay.h"
 
 #ifdef UDPRELAY_REMOTE
 #define MAX_UDP_CONN_NUM 1024