diff --git a/shadowsocks/Dockerfile b/shadowsocks/Dockerfile
index 7e5dd13..8db0977 100644
--- a/shadowsocks/Dockerfile
+++ b/shadowsocks/Dockerfile
@@ -18,7 +18,7 @@ ENV METHOD      aes-256-cfb
 ENV TIMEOUT     300
 ENV WORKERS     10
 
-EXPOSE 8388
+EXPOSE $SERVER_PORT
 
 CMD ssserver -s $SERVER_ADDR \
              -p $SERVER_PORT \
diff --git a/shadowsocks/libev/Dockerfile b/shadowsocks/libev/Dockerfile
index c114e99..559e2fa 100644
--- a/shadowsocks/libev/Dockerfile
+++ b/shadowsocks/libev/Dockerfile
@@ -20,7 +20,7 @@ ENV METHOD      aes-256-cfb
 ENV TIMEOUT     300
 ENV DNS_ADDR    8.8.8.8
 
-EXPOSE 8388
+EXPOSE $SERVER_PORT
 
 CMD ss-server -s $SERVER_ADDR \
               -p $SERVER_PORT \