diff --git a/src/common.h b/src/common.h
index f7ab3d95..3738da3b 100644
--- a/src/common.h
+++ b/src/common.h
@@ -45,7 +45,7 @@ int init_udprelay(const char *server_host, const char *server_port,
 
 void free_udprelay(void);
 
-#ifdef ANDROID
+#ifdef __ANDROID__
 int protect_socket(int fd);
 int send_traffic_stat(uint64_t tx, uint64_t rx);
 #endif
diff --git a/src/local.c b/src/local.c
index db95b149..0ae0be89 100644
--- a/src/local.c
+++ b/src/local.c
@@ -89,7 +89,7 @@ int verbose        = 0;
 int reuse_port     = 0;
 int keep_resolving = 1;
 
-#ifdef ANDROID
+#ifdef __ANDROID__
 int vpn        = 0;
 uint64_t tx    = 0;
 uint64_t rx    = 0;
@@ -312,7 +312,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
 
             // insert shadowsocks header
             if (!remote->direct) {
-#ifdef ANDROID
+#ifdef __ANDROID__
                 tx += remote->buf->len;
 #endif
                 int err = crypto->encrypt(remote->buf, server->e_ctx, BUF_SIZE);
@@ -333,7 +333,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
             }
 
             if (!remote->send_ctx->connected) {
-#ifdef ANDROID
+#ifdef __ANDROID__
                 if (vpn) {
                     int not_protect = 0;
                     if (remote->addr.ss_family == AF_INET) {
@@ -682,7 +682,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
             }
 
             if (acl
-#ifdef ANDROID
+#ifdef __ANDROID__
                     && !(vpn && strcmp(port, "53") == 0)
 #endif
                     ) {
@@ -698,7 +698,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
                 else if (host_match < 0)
                     bypass = 0;                 // proxy hostnames in white list
                 else {
-#ifndef ANDROID
+#ifndef __ANDROID__
                     if (atyp == 3) {            // resolve domain so we can bypass domain with geoip
                         err = get_sockaddr(host, port, &storage, 0, ipv6first);
                         if (err != -1) {
@@ -743,7 +743,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
                         else if (atyp == 4)
                             LOGI("bypass [%s]:%s", ip, port);
                     }
-#ifndef ANDROID
+#ifndef __ANDROID__
                     if (atyp == 3 && resolved != 1)
                         err = get_sockaddr(host, port, &storage, 0, ipv6first);
                     else
@@ -831,7 +831,7 @@ server_send_cb(EV_P_ ev_io *w, int revents)
     }
 }
 
-#ifdef ANDROID
+#ifdef __ANDROID__
 void
 stat_update_cb()
 {
@@ -893,7 +893,7 @@ remote_recv_cb(EV_P_ ev_io *w, int revents)
     server->buf->len = r;
 
     if (!remote->direct) {
-#ifdef ANDROID
+#ifdef __ANDROID__
         rx += server->buf->len;
         stat_update_cb();
 #endif
@@ -1295,7 +1295,7 @@ main(int argc, char **argv)
 
     USE_TTY();
 
-#ifdef ANDROID
+#ifdef __ANDROID__
     while ((c = getopt_long(argc, argv, "f:s:p:l:k:t:m:i:c:b:a:n:huUvV6A",
                             long_options, NULL)) != -1) {
 #else
@@ -1389,7 +1389,7 @@ main(int argc, char **argv)
         case '6':
             ipv6first = 1;
             break;
-#ifdef ANDROID
+#ifdef __ANDROID__
         case 'V':
             vpn = 1;
             break;
diff --git a/src/tunnel.c b/src/tunnel.c
index b40096dd..77c73802 100644
--- a/src/tunnel.c
+++ b/src/tunnel.c
@@ -80,7 +80,7 @@ static void close_and_free_remote(EV_P_ remote_t *remote);
 static void free_server(server_t *server);
 static void close_and_free_server(EV_P_ server_t *server);
 
-#ifdef ANDROID
+#ifdef __ANDROID__
 int vpn = 0;
 #endif
 
@@ -662,7 +662,7 @@ accept_cb(EV_P_ ev_io *w, int revents)
         return;
     }
 
-#ifdef ANDROID
+#ifdef __ANDROID__
     if (vpn) {
         int not_protect = 0;
         if (remote_addr->sa_family == AF_INET) {
@@ -803,7 +803,7 @@ main(int argc, char **argv)
 
     USE_TTY();
 
-#ifdef ANDROID
+#ifdef __ANDROID__
     while ((c = getopt_long(argc, argv, "f:s:p:l:k:t:m:i:c:b:L:a:n:huUvV6A",
                             long_options, NULL)) != -1) {
 #else
@@ -893,7 +893,7 @@ main(int argc, char **argv)
         case '6':
             ipv6first = 1;
             break;
-#ifdef ANDROID
+#ifdef __ANDROID__
         case 'V':
             vpn = 1;
             break;
diff --git a/src/udprelay.c b/src/udprelay.c
index e3470e72..9690fa10 100644
--- a/src/udprelay.c
+++ b/src/udprelay.c
@@ -85,7 +85,7 @@ static void query_resolve_cb(struct sockaddr *addr, void *data);
 static void close_and_free_remote(EV_P_ remote_ctx_t *ctx);
 static remote_ctx_t *new_remote(int fd, server_ctx_t *server_ctx);
 
-#ifdef ANDROID
+#ifdef __ANDROID__
 extern uint64_t tx;
 extern uint64_t rx;
 extern int vpn;
@@ -736,7 +736,7 @@ remote_recv_cb(EV_P_ ev_io *w, int revents)
     buf->len -= len;
     memmove(buf->data, buf->data + len, buf->len);
 #else
-#ifdef ANDROID
+#ifdef __ANDROID__
     rx += buf->len;
     stat_update_cb();
 #endif
@@ -924,7 +924,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
 
 #ifdef MODULE_LOCAL
 #if !defined(MODULE_TUNNEL) && !defined(MODULE_REDIR)
-#ifdef ANDROID
+#ifdef __ANDROID__
     tx += buf->len;
 #endif
     uint8_t frag = *(uint8_t *)(buf->data + 2);
@@ -1150,7 +1150,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
         }
 #endif
 
-#ifdef ANDROID
+#ifdef __ANDROID__
         if (vpn) {
             if (protect_socket(remotefd) == -1) {
                 ERROR("protect_socket");
diff --git a/src/utils.h b/src/utils.h
index 6ec04073..3997e9d7 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -46,7 +46,7 @@
 #define PORTSTRLEN 16
 #define SS_ADDRSTRLEN (INET6_ADDRSTRLEN + PORTSTRLEN + 1)
 
-#ifdef ANDROID
+#ifdef __ANDROID__
 
 #include <android/log.h>
 #define USE_TTY()
@@ -58,7 +58,7 @@
     ((void)__android_log_print(ANDROID_LOG_ERROR, "shadowsocks", \
                                __VA_ARGS__))
 
-#else // not ANDROID
+#else // not __ANDROID__
 
 #define STR(x) # x
 #define TOSTR(x) STR(x)
@@ -159,7 +159,7 @@ extern int use_syslog;
 
 #endif // if LIB_ONLY
 
-#endif // if ANDROID
+#endif // if __ANDROID__
 
 void ERROR(const char *s);