diff --git a/apps/srt-tunnel.cpp b/apps/srt-tunnel.cpp
index 4de37d539..785b49c6b 100644
--- a/apps/srt-tunnel.cpp
+++ b/apps/srt-tunnel.cpp
@@ -458,7 +458,7 @@ class TcpMedium: public Medium
 
     enum { DEF_SEND_FLAG = 0 };
 
-#elif defined(LINUX)
+#elif defined(LINUX) || defined(GNU)
     static int tcp_close(int socket)
     {
         return ::close(socket);