diff --git a/puncher.nim b/puncher.nim
index b1c530c..a4f5b41 100644
--- a/puncher.nim
+++ b/puncher.nim
@@ -63,6 +63,7 @@ proc punch(puncher: Puncher, peerIp: IpAddress, peerPort: Port,
       # TODO: replace asyncdispatch.sendTo with asyncnet.sendTo (Nim 1.4 required)
       await sendTo(puncher.sock.getFd().AsyncFD, msg.cstring, msg.len,
                    cast[ptr SockAddr](addr peerAddr), peerSockLen)
+      await sleepAsync(20)
     if lowTTL:
       puncher.sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, defaultTTL)
   except OSError as e: