diff --git a/websockify/websocket.py b/websockify/websocket.py
index 6d4d8cb..7dda6bf 100644
--- a/websockify/websocket.py
+++ b/websockify/websocket.py
@@ -447,11 +447,11 @@ class WebSocket(object):
 
     def ping(self, data=None):
         """Write a ping message to the WebSocket."""
-        self._sendmg(0x9, data)
+        self._sendmsg(0x9, data)
 
     def pong(self, data=None):
         """Write a pong message to the WebSocket."""
-        self._sendmg(0xA, data)
+        self._sendmsg(0xA, data)
 
     def shutdown(self, how, code=1000, reason=None):
         """Gracefully terminate the WebSocket connection.