diff --git a/pydle/features/rfc1459/client.py b/pydle/features/rfc1459/client.py
index 32bcff3..6fe10ad 100644
--- a/pydle/features/rfc1459/client.py
+++ b/pydle/features/rfc1459/client.py
@@ -547,7 +547,7 @@ class RFC1459Support(BasicClient):
 
     def on_raw_pong(self, message):
         """ PING response. """
-        identifier = message.params[0]
+        identifier = message.params[-1]
         self._on_pong_received(identifier)
 
     def on_raw_privmsg(self, message):