diff --git a/plugins/relay.py b/plugins/relay.py
index 2955dab..6645a8e 100644
--- a/plugins/relay.py
+++ b/plugins/relay.py
@@ -673,7 +673,7 @@ def handle_kill(irc, numeric, command, args):
         # client and rejoin it to its channels.
         del relayusers[realuser][irc.name]
         remoteirc = world.networkobjects[realuser[0]]
-        for remotechan in remoteirc.channels:
+        for remotechan in remoteirc.channels.copy():
             localchan = findRemoteChan(remoteirc, irc, remotechan)
             if localchan:
                 modes = getPrefixModes(remoteirc, irc, localchan, realuser[1])