diff --git a/sedbgmux.py b/sedbgmux.py
index 6ec06d4..6938fef 100755
--- a/sedbgmux.py
+++ b/sedbgmux.py
@@ -129,6 +129,7 @@ class SEDbgMuxApp(cmd2.Cmd):
         f = self.peer.recv()
         assert f['MsgType'] == DbgMuxFrame.MsgType.Pong
         log.info('Rx Pong with payload \'%s\'', f['Msg'])
+        self.peer.send(DbgMuxFrame.MsgType.Ack)
 
     establish_parser = cmd2.Cmd2ArgumentParser()
     establish_parser.add_argument('DPRef',